Change Log¶

v3.23.0 (2023-01-18)¶

Generate a dedicated data directory per experiment
Support Synopsys Common Licensing
Introduce testknob NAME optimizer-ctl action
Properly set POSIX exit code when optimizer-ctl encounters an error
Add embedded knobs for gcc-12.2
Update examples to reflect the new recommended Studio CLI
Report optional knob test failure on the console of optimizer-ctl init or run
Fix occasional failure to report status
Multiple bug fixes and stability enhancements

v3.22.0 (2022-11-30)¶

Allow optimization stage detailed configuration in the knob file
Retire --max-minutes command line parameter
Streamline sysinfo formatting reported to Conductor
Retire obsolete data fields in CSV file generation
Update and introduce new examples: postgresql, python, iozone
Improve error reporting in optimizer-ctl
Support different output formats in optimizer-ctl status
Multiple bug fixes and stability enhancements

v3.21.0 (2022-10-02)¶

Enhance and clarify error messages
Report metrics list along with the inventory
In parallel mode suspend workers when idle
In parallel mode report worker ID in the CSV file
Introduce global_settings:exit_timeout - Optimizer must complete shutdown procedure (60s by default)
Update examples
Update PVTC sampling plugin to use the latest library
Bug fixes and stability enhancements

v3.20.0 (2022-07-27)¶

Introduce experimental async invocation mode (optimizer-ctl run)
Verify target metric definition correctness prior to sampling
Introduce Synopsys PVTC based sampling plugin (libpvtc-metrics.so)
Changes to knob set policy: a normal knob can be set always, enable 1-option knobs
Enable exporting metrics via OpenTelemetry
Upgrade NATS server version
Bug fixes and stability enhancements

v3.19.0 (2022-06-14)¶

Introduce Ubuntu jammy (22.04) packages
Retire Ubuntu xenial (16.04) packages
Refresh parallel workload examples to reflect recent workload features
statsd server can now be defined in knobs.yaml definition file
Introduce statsd port settings with server setting
statsd now reports all metrics collected by optimizer
Bug fixes and stability enhancements

v3.18.0 (2022-04-20)¶

Introduce Linux perf based sampling plugin (libperf-metrics.so)
Introduce relocatable RPM - experimental for CentOS-7
Upgrade build infrastructure
Examples: introduce (GPU) CUDA kernels optimization
Bug fixes and stability enhancements

v3.17.0 (2022-03-22)¶

Knobs: enhance option range with math expression
Optimizer-ctl: introduce action queueing
Examples: update examples with the recent features
Bug fixes and stability enhancements

v3.16.1 (2022-02-22)¶

Replay CSV: enable backward compatibility with Web Service generated file
Switch to Protobuf for internal communications

v3.16.0 (2022-02-16)¶

Introduce workload abort condition
Enhance the replay command with higher precision
Retire deprecated workload_settings section from a knob file
Numerous bug fixes and stability enhancements

v3.15.1 (2022-02-02)¶

Replace CentOS 8 package with RockyLinux 8 package, as CentOS 8 has reached EOL
Add an optimization example for RISCV
Retire 'max_samples' param. in stages definition
Fix a bug in replay command
Fix a bug in timeout format parsing
Experimentally switch to using Protobuf for internal communications

v3.15.0 (2022-01-24)¶

Optimizer-ctl: introduce 'refine' command (applicable to any configuration)
Parallel mode: improve scalability by aborting excessive jobs
Fix Studio progress display. In particular, display progress of the current action in the Idle mode.
Numerous bug fixes and stability enhancements

v3.14.0 (2021-12-27)¶

Optimizer-ctl: introduce 'analyze' command
Optimizer-ctl: introduce 'sample' command
Optimizer Studio: introduce 'idle' stage to handle optimizer-ctl requests
Switch to invalid search only from the optimization stage
Stages: avoid excessive samples in validation stage
Stop tolerating non-existent files in attachements section
Numerous bug fixes and stability enhancements

v3.13.0 (2021-11-30)¶

Support file attachement in workload definition
Notify user about new Optimizer Studio version availability
Export all the metrics (including the disabled ones)
Update embedded compiler flags examples
Decrease the volume of web-client log messages
Parallel mode: assert knob file identity on every worker
Parallel mode: report worker status via optimizer-ctl
Stages: validation stage definition in the knob file is optional
Numerous bug fixes and stability enhancements

v3.12.0 (2021-10-25)¶

Completely revised parallel optimization mode compatible with normal workload definition
Optimizer-ctl: introduce 'apply_config' command
Optimizer-ctl: enhance error handling
Introduce a SPEC AOCC example
Introduce 3 new accelerator examples
Support 3 new accelerator knobs
Do not require options in an overridden knob
Numerous bug fixes and stability enhancements

v3.11.0 (2021-09-23)¶

Embedded knobs: introduce additional LLVM compiler flags
Support relocatable installation directory. Optimizer Studio can be moved to an alternative location
Retire async sampling mode
Fix rare Validation stage failure

v3.10.0 (2021-09-07)¶

Embedded knobs: enhance LLVM compiler flags (Clang-13). Fixed functionality for initial mllvm flag as well as adding more mllvm flags
Update licensing and other 3rd-party dependencies

v3.9.0 (2021-08-30)¶

Embedded knobs: introduce up-to-date LLVM compiler flags (Clang-13)
Workload definition: enable getting multiple knobs via {{}} template
Improve Knob Refinement algorithm
Revisit Knob Refinement configuration params: refinement_std_tolerance, refinement_improv_tolerance
Introduce new accelerator knobs: uname, exec, stat
Fix inability to test a single knob
Fix security vulnerabilities
Numerous bug fixes and stability enhancements

v3.8.1 (2021-08-05)¶

Hot fix default stage list incompatibility with the community license
Improved testing coverage

v3.8.0 (2021-08-01)¶

Introduce optimizer-ctl set_baseline command allowing to set any configuration as next experiment baseline
Update parallel mode syntax definition
Update parallel mode examples
Fix bug in Community license
Additional bug fixes and stability enhancements

v3.7.0 (2021-07-22)¶

Introduce support for Arm and x64 CPU based architectures enriched inventory for Conductor auditing view
Introduce more robust INI parser for mysql embedded knobs
Bug and stability fixes

v3.6.0 (2021-07-08)¶

Introduce advanced functionality for declarative workload definition. More details here
Bug and stability fixes

v3.5.0 (2021-06-7)¶

Introduce async, accelerate and other enhanced features for declarative workload definition
sum_a_b_c_async example added for advanced async mode use case demonstration
Bug and stability fixes

v3.4.1 (2021-05-19)¶

Hot patch for workload timeout feature
Hot patch for optimizer crash in retain mode during validation stage

v3.4.0 (2021-05-14)¶

Introduce declarative workload settings in experiment definition (knobs.yaml). More information can be found at configuration documentation
Update many experiment examples with new declarative workload syntax
Bug and stability fixes

v3.3.1 (2021-04-30)¶

Hot patch for out_directory global setting in root user mode
Hot patch to Mysql sysbench example
Additional examples improvement

v3.3.0 (2021-04-28)¶

Introduce Mysql 8 embedded knobs with updated sysbench example
Improve various examples, demonstrating new features such as stages, custom inventory and posting sample meta data
Introduce exclude_error Boolean option for finer control over invalid search mechanism, to pass on searching in case of workload errors such as timeouts
Bug and stability fixes

v3.2.1 (2021-04-19)¶

Hot patch for supporting Arm platforms.
Hot patch for avoiding local optimizer timeout issues.

v3.2.0 (2021-04-08)¶

Introduce "expression" target metric. It is now possible to express target metric as a function of other metrics, using inja templates
Prometheus sampling plugin: enable adding recent sample duration to the query definition
Sampling plugins: improve user interface and error reporting
Introduce Accelerator metrics. It is now possible for Optimizer to retrieve metrics from accelerated programs. Currently supported metric: duration
Optimizer studio log respects out_directory global settings parameter
Invalid search is now invoked only for compiler flag mining by default
Bug and stability fixes

v3.1.1 (2021-03-09)¶

Hot fix for accelerate liblog packaging bug
Bug and stability fixes

v3.1.0 (2021-03-01)¶

Introduce Automatic Invalid knob configuration management - information about invalid configurations found during an experiment can be reused in subsequent experiments
Add --replay-mode parameter to control samples replayed from a CSV (valid, invalid, all, default: valid)
Introduce logger accelerator. Using a simple knob definition, application logging can be accelerated
Introduce accelerator filters. Using a simple knob filter definition, it is possible to control which processes will be affected by an accelerator
Upload console log to Experiment Management System at the end of experiment
Bug and stability fixes

v3.0.1 (2021-02-10)¶

Hot patch for optimizer-ctl download_project command

v3.0.0 (2021-02-09)¶

Introduce Experiment Management System Walkthough Wizard support. It is now a lot easier to create knobs.yaml definition from EMS and download the project files, including auto-generated workload.sh script to run the experiment locally, using optimizer-ctl download_project command
Introduce "rational" target metric. it is now possible to define a target metric that represents a ratio of two other metrics
Introduce accelerate application with arguments injected knobs
Introduce accelerate application with environment variable injected knobs
Introduce accelerate application by caching excessive system calls
Bug and stability fixes

v2.23.0 (2021-02-01)¶

Improve invalidation mechanism during optimization stage
Introduce application memory allocation acceleration libraries
Introduce knob policies: always, set-once, on-change (default), in order to support acceleration libraries
Introduce optimizer-ctl command, tranforming optimizer-studio acceleration knob recommendations into optimizer-runtime configuration
Bug and stability fixes

v2.22.0 (2021-01-11)¶

Add application accelerator - new functionality to speed up applications using acceleration libraries
Implement "net.throughput". An embedded target metric to measure generic network throughput
Bug and stability fixes

v2.21.0 (2020-12-07)¶

Report knob configuration status to Experiment Management System (active, complete, etc.) and display in GUI
Improve display for Welch t-test validation test report
Bug and stability fixes

v2.20.0 (2020-11-30)¶

Introduce additional embedded knobs for CPU tuning
Add a column with point estimator values to metrics.csv
Fix problems with using percentile as a point estimator
Bug and stability fixes

v2.19.0 (2020-11-22)¶

Update JVM example to use more stable benchmark als->scala-stm-bench7
Embedded Linux OS knobs: add transparent huge page knob
Add embedded ZFS knobs
Optimizer Studio now prints out reports of Readiness and Validation stages on console
It is possible to download CSV file with samples from Web Service and replay in Optimizer Studio
Stop supporting CentOS 6, as it reaches its End Of Life
Bug and stability fixes

v2.18.1 (2020-11-01)¶

Introduce embedded knobs for optimization of run time library jemalloc and a corresponding example
Fix startup failure on slow networks

v2.18.0 (2020-10-27)¶

Add example of using BlazeMeter for optimizing Nginx
Add example of optimizing Intel compiler (icc) flags
Add Dynatrace metrics plugin
Add Datadog metrics plugin and optimization example
Implement Welch t-test during Validation stage
Improve the stability of the communication with Web Service, make it more resilient to errors
Rename optimizer-studio-license utility to optimizer-license
Bug and stability fixes

v2.17.0 (2020-10-04)¶

New command line flag --debug-workload allows verbose output when running first iterations of a workload script in order to understand the interaction with the Optimizer Studio
Bug fix: if an experiment is restored with --retain parameter, if the readiness stage was the last active one, it continues from the point it's stopped
Bug and stability fixes

v2.16.0 (2020-09-14)¶

Connection to Experiment Management System - make use of https_proxy/ http_proxy environment variables and apply proxy settings automatically
Support user defined experiment inventory data and add a corresponding example
Connection to Experiment Management System - support OPTIMIZER_STUDIO_WEB_TOKEN environment variable in addition to the corresponding global parameter setting
Optimizer Studio log files are now created along existing optimizer engine log files
Add support for Python interpreter optimization (cpython) and optimization example
Optimizer Studio examples were updated to make use of a new File Metrics Plugin and simplify knob file configuration
Bug and stability fixes

v2.15.1 (2020-09-01)¶

Bug fix: increase http_buffer_size default to be able to pass larger samples to Experiment Management System

v2.15.0 (2020-08-31)¶

Settings script, created as a result of optimization session, is uploaded to Experiment Management System
Send experiment metadata to Experiment Management System
Send computer inventory list to Experiment Management System
Support adding metadata for each sample
Added metrics plugin and example for New Relic APM
Embedded_jvm example has been updated to the latest version 0.11 of the Renaissance Benchmark Suite
Bug and stability fixes

v2.14.0 (2020-08-14)¶

Introduce optimizer-ctl utility - login to SaaS service, create project etc, directly from CLI
Introduce embedded knobs for Intel C/C++ compiler (icc)
Global settings parameters can include now environment variables
File metrics plugin: check for metrics file really updated by the workload script
Bug fix: knob values loaded during replaying of a CSV file, shall be considered as valid
Bug and stability fixes

v2.13.0 (2020-07-22)¶

Optimizer Studio Stages defined: Readiness, Optimization, Refinement, Validation, using command line parameter --stages. Deprecate command line parameters --no-refine and --refine-only; the same functionality is avaliable in Refinement stage.
Added support for SolarFlare Onload NIC embedded knobs
Added a_plus_b_wsl example for running in Windows Subsystem for Linux (WSL)
Added metrics plugin for Prometheus server
Added support of json metric results in file metrics plugin
Modify some global parameters specifying time duration to use time units. Old parameters are deprecated
Bug and stability fixes

v2.12.0 (2020-06-28)¶

Support additional embedded knobs for gcc 10 - vectorization and inlining
Added embedded knobs for optimization of Golang garbage collection performance
Added examples for optimization of Golang garbage collection parameters
Improved error diagnostic messages in many cases
Support licensing on Ubuntu 18.04 and Ubuntu 20.04 on ARM64 platform
Move metric plugin shared libraries into plugins subdirectory and rename some libraries
Load required plugins automatically according to a metric name
Knob files: deprecate usage of 'options_script' tag, in favor of 'options/script' definition
Minor fixes and improvements in conectivity with Experiment Management System
Other bug and stability fixes

v2.11.0 (2020-06-02)¶

Improve connectivity features with Experiment Management Service
Add support for Community license. Community license is now default one if a user has no other license
Update JVM embedded knobs and usage examples - improve robustness
Update NGINX embedded knobs and usage examples - better support of default settings
Bug and stability fixes

v2.10.2 (2020-05-19)¶

Added example of gcc compilation flag mining in concurrent optimization mode
Bug and stability fixes

v2.10.1 (2020-05-14)¶

Bug and stability fixes

v2.10.0 (2020-05-11)¶

Optimizer Studio connects to new Experiment Management Service
Add support for Ubuntu 20.04 on x86_64 and arm64 platforms
Add support for Ubuntu 18.04 on arm64 (x86_64 has been already supported)
Stop supporting Ubuntu 14.04
optimizer-studio is now a binary executable rather than bash script
Add file metrics plugin, which simplifies passing workload metrics via files
Modify a_plus_b and sum_a_b_c examples to use file metrics plugin
JVM embedded knobs: allow empty default knob values
JVM embedded knobs: improve some parameters to reduce too big number of options to test
Bug and stability fixes

v2.9.1 (2020-03-27)¶

Fix intermittent crash during saving of report.json

v2.9.0 (2020-03-23)¶

Add an example of SPEC CPU 2017 benchmark suite optimization using GCC knobs
Allow early stop of exploration of a knob configuration if it doesn't contribute to target metric improvement
Metrics.csv file format slightly changed: knob_settings column now stores knob configuration in JSON rather than non-standard text string
Bug and stability fixes

v2.8.0 (2020-03-16)¶

Introduce embedded knobs for LLVM compiler
Add examples of optimization of compilation with LLVM compiler
Improve JVM embedded knobs by adding boolean knobs
Add an example of SPEC CPU 2017 benchmark suite optimization
User can define an alternative baseline configuration
Bug and stability fixes

v2.7.0 (2020-02-27)¶

Introduce NGINX web server and proxy embedded knobs
Introduce NGINX optimization example
Introduce a Python workload example
Introduce replaceable target metric point estimation function (average, percentile, mode)
Bug and stability fixes

v2.6.0 (2020-01-31)¶

Knob Refinement functionality change - optimizer shall now run two-phase refinement automatically instead of choosing a strategy (logarithmic then one-by-one)
Introduce basic StatsD protocol support. By adding statsd_server: <ip> to settings.yaml, optimizer will attempt pushing target metric to statsd server if available.
Improve knob name and options validation
Improve recovery in rare cases of abnormal crashes
Retire support for SLES 11 SP4, as it is EOL in March.2020
Bug and stability fixes

v2.5.0 (2019-12-30)¶

Introduce Knob Refinement functionality - a post processing that allows to clean up insignificant changes from the best knob configuration
Introduce Seed Knob Configurations functionality that allows to reuse the results of one optimization experiment to speed up another one by providing a better starting point
Testing all knobs is performed now prior to running optimization
Add more embedded network optimization knobs
Add Redis embedded knobs
Add Redis optimization example
Support for SLES 11 SP4 has been retired, as SLES 11 SP4 is EOL in March.2020
Bug and stability fixes

v2.4.0 (2019-12-12)¶

Introduce "Replay metrics.csv" functionality
Allow default file names for knobs file (knobs.yaml) and workload script (workload.sh)
Add option to the result setting script to get knob values as Bash array variable
Add '--show' option to the optimizer-studio-license tool to show information about the license
Add embedded knobs for JVM engine - from version 8 and above
Add example of JVM optimization
Minor changes in CSV format: replace start and end time fields with a single epoch time timestamp to simplify integration with metric collection tools.
Minor format change in console output. Baseline knob values are marked, if present in the best known settings:

   Best known knob settings so far:
   A: 8
   B: 8
   C: 8 [baseline]

Bug and stability fixes

v2.3.1 (2019-11-13)¶

Mellanox knobs: more robust error handling
"duration" metric is minimized by default
Improve wording of some options of Optimizer Studio Help and some error messages
Cancel usage of "-j" switch of jq utility thus allowing to use older versions of jq
Improve embedded gcc example to optimize the example application behavior rather than compilation time
Embedded gcc knobs: use "empty" as a default for all options, rather than the first value in the list
Other bug and stability fixes

v2.3.0 (2019-10-31)¶

Bug and stability fixes

v2.2.0 (2019-10-24)¶

Reorganize example folder names to group together related or similar examples
Changed defaults of parameters min_baseline_samples and min_samples_per_config for better fit to background noise
MySQL embedded knobs are now POSIX shell compliant. bash is no longer required
Minor fixes in PHP and Apache embedded knobs
Metrics.csv file: added new columns, reorganized order of columns
Bug and stability fixes

v2.1.1 (2019-09-24)¶

Bug and stability fixes

v2.1.0 (2019-09-19)¶

New Licensing mechanism implemented
Optimizer Studio will fail if one of scripts ends with an error
Bug and stability fixes

v2.0.2 (2019-09-10)¶

Added example of workload requiring system reboot when setting knob values
Bug fixes

v2.0.1 (2019-08-20)¶

Implemented %x and %X format specifiers for knob option format

v2.0 (2019-08-08)¶

Added a possibility to run workload on several nodes in parallel
Added support for optimization of Yarn, MapReduce and Spark Hadoop services
Added examples for optimization of Yarn, MapReduce and Spark Hadoop services
Added support for PHP7 optimization
Added support for optimization of Apache2 Web Server
Bug and stability fixes

v1.23 (2019-07-25)¶

Added support for HipHop Virtual Machine (HHVM) optimization
Added example of HipHop Virtual Machine (HHVM) optimization
Added global parameter max_samples_per_config
Added global parameter pending_config_timeout_minutes
Rename some global parameters:

Old name	New name
min_samples_per_option	min_samples_per_config
max_invalid_samples_per_option	max_invalid_samples_per_config
max_option_mean_cv	max_config_mean_cv

Bug and stability fixes

v1.22 (2019-05-13)¶

Added example of integration of Optimizer Studio with Apache JMeter load testing tool
Added support for OpenMPI optimization
Added example of optimization of OpenMPI parameters for GROMACS benchmark
Bug and stability fixes

v1.21 (2019-04-11)¶

Added support for MySQL optimization
Added MySQL optimization example
Fixed improvement percentage calculation for the case of target metric minimization
Bug and stability fixes

v1.20 (2019-02-21)¶

Enabled creation of CSV metrics files distinguishable by creation DATE
Enabled creation of CSV metrics files by default
Implemented tolerance for missing target metric values
Improved error handling
Improved logging messages

v1.19 (2019-02-10)¶

Enabled creation of CSV metrics files distinguishable by Optimizer Studio PID
Enabled fast-forwarding optimization progress to 100% when all the configurations are studied
Implemented sanity watchdog preventing Optimizer Studio from staying in memory after SSH session termination
Added Android/Geekbench optimization example
Added Mellanox NIC optimization example
Added PGBench optimization example
Added call to pre/post set script(s) in Mellanox NIC embedded knob file
Fixed bug in settings script generation, where pre/post set script(s) would not be called
Cleaned up logger output
Enhanced progress report format and testknob report
Enhanced error reporting by eliminating occasional wrong error messages

v1.18 (2019-01-16)¶

Added --report=status command line parameter for getting status report during long sessions
Added --session=SESSIONID command line parameter, specifying a certain session ID for a report
Added --workload-timeout command line parameter which allows killing too long workloads
Removed --warmup-minutes command line parameter as not useful one
Optimization progress line has been modified
Bug fixes and minor enhancements

v1.17 (2019-01-06)¶

Implemented experimental basic knob dependency functionality
Added baseline knobs display along with tuned knobs when calling the best settings script with --show tuned arguments
Enabled explicit maximizing/minimizing of workload target metric
Enhanced Optimizer Studio statistics display
Extended the list of examples provided along with Optimizer Studio
More bug fixes and minor enhancements

v1.16 (2018-12-06)¶

Added --show command line option to the best settings script. This option allows to display only knob configuration
Fixed missing license expiration message
Fixed network-related knobs definition
Fixed storage-related knobs definition
Fixed instability in ongoing improvement calculation
Fixed some example code
More bug fixes and minor enhancements

v1.15 (2018-10-17)¶

Added package for Ubuntu 18.04 (Bionic Beaver)
The Evolution optimization strategy is now the default. The Greedy strategy is still available and can be enabled by explicitly specifying it in the configuration settings
Added configuration settings for Evolution optimization strategy specifics
The number of explored options of a knob by the Greedy optimization strategy is now limited by the configuration parameter max_options_per_knob (default value: 12)
Added support for using device scripts with memory knobs
The embedded MSR knobs now use rdmsr/wrmsr from the default path instead of from /usr/sbin
More bug fixes and minor changes

v1.14 (2018-09-16)¶

Implemented support of knob option definition using numeric ranges
Added examples of optimizing MongoDB and Phoronix Redis benchmark
Bug fixes and minor changes

v1.13 (2018-08-22)¶

Evolution-based optimization algorithm implemented. Users can now select between the Greedy algorithm and the new Evolution optimization strategies.
Stricter YAML file validation implemented. Note that existing user configuration files might fail to load if they have illegal fields and values.
Added support for spaces in knob names and option values
Added support for empty knob option values
It's possible now to define a default value for a memory knob, which is used as its baseline. If not specified - the first value in the list of options is used
Several users can run Optimizer Studio in parallel
Added more examples
Bug fix: Optimization Studio behaves more stable during initialization, when initialization takes a certain time
Bug fix: Setting script created as a result of Optimization Studio run, can be now executed successfully if some knobs use functions or variables in their set scripts
Optimizer Studio now supports having only one baseline sample, down from 3

v1.12 (2018-08-03)¶

Optimizer Studio now can be run by non-privileged users. If the optimization project requires access to privileged system resources, then Optimizer Studio needs to be run as a root user
Improved validation of YAML files
Added support and example of usage of script-less knobs passed as array to workload script
Optimizer Studio now supports SuSE SLES 11 SP4

v1.11 (2018-07-23)¶

Added support for complex workload specification and multi-objective optimization via scalarization of the target metric
Anticipated improvement report now also includes the raw value of the target metric alongside the percentage improvement
Optimizer service now runs as a background application instead of as a system service
Added syntax validation for YAML files
Improved error reporting
Added studio-funcs.bash script for facilitating communications between user workload scripts and Optimizer Studio
Memory knobs are now also passed as an array to the workload scripts
Bug fix: Sometimes knob and metric information passed to the workload scripts were lost when many knobs and metrics were modified
Bug fix: Removed invalid samples that appeared at the end of the optimization
Various other bug fixes and minor improvements

v1.10 (2018-07-03)¶

If --max-minutes parameter has been specified, Optimizer Studio now will run until the specified time is over, continuously exploring new knob combinations
Bug fixes in stopping Optimizer Studio by Ctrl+C

v1.9 (2018-06-25)¶

New import capability to import configuration files, filter imported knobs by name
Support for onload and enable scripts per configuration file
Allow sourcing shell files in configuration files
Improved synchronization mechanism between the optimizer-studio script and the optimizer background process
Added support for running embedded knobs on remote devices
Allow specifying certain settings in the main knob configuration files
Bug fix: Values of script-less knobs are now reported in the console output
Bug fix: Comparison between different configurations is now calculated correctly when speedup is high

v1.8 (2018-06-12)¶

Added support for skipping configurations that yield more than max_invalid_samples_per_option invalid measurements
Added a settings parameter sum_cvs_coefficient that controls the threshold for selecting beneficial configurations
Space character is now allowed in command line parameters for parameters that previously required a '=' character. For example "--knobs ./my_knobs.yaml" will now work like "--knobs=./my_knobs.yaml"
When no include_metrics and exclude_metrics are defined, the default is now to include all metrics
Added an example folder containing one example of optimizing a sum of two integers using Optimizer Studio
Bug fix: Corrected calculation of improvement of configurations that resulted in choosing configurations with lower incremental benefit when the general target metric improvement was high
Bug fix: Optimizer Studio now works correctly in RHEL 7 and Ubuntu 14.04
Bug fix: When using script-less knobs, final settings script will now contain values for all knobs, even if they remain at baseline
Bug fix: Correct target metric is shown now at Optimizer Studio

v1.7 (2018-06-04)¶

Introduce script-less memory knobs whose values are passed to the workload script as environment variables
Report anticipated improvement during and at the end of the optimization run
Report the number of different configurations checked during optimization
More accurate optimization progress calculation for longer running workloads
Bug fix: Require fewer baseline samples at the beginning

v1.6 (2018-05-15)¶

Increase default maximum workload time from 10 min to 1 hour
Fix bug preventing Optimizer Studio to work on CentOS 7 in synchronous sampling mode
Report anticipated performance improvement
New knob: Symmetric Multithreading (SMT) is now supported in the embedded knobs

v1.5 (2018-05-03)¶

Fix bug causing Optimizer to hang indefinitely at the end of the run in some situations
Improved and more stable progress reporting
Change Ctrl+C processing - pressing 3 times Ctrl+C will abort the Studio immediately
Ctrl+C now can stop --testknob=all run
Create more detailed report of testknob function
Make possible to define user target metric when using embedded knobs
Fix bug causing wrong handling of parameters of a workload. Now parameters can be passed on optimizer-studio command line

v1.4 (2018-04-24)¶

Fix bug related to progress reporting in certain environments
Fix bug that resulted in redundant measurements
Use regular characters instead of UTF8 in progress reporting
Settings script is now created only when optimal settings are found
Slightly revised settings script
More descriptive help message

v1.3 (2018-04-17)¶

Introduce sampling-mode command line parameter
Fix bug in progress reporting
Shorten cleanup time on exit

v1.2 (2018-04-12)¶

Fix bug causing runtime crash at the end of optimization
Optimization can continue in case of failures causing optimization runtime restart
cpu.cache_prefetch knob will use only legal option values
Improve operation in virtual environments by preventing hardware specific sampling
--testknob=all is now a working option (bug fix)

v1.1 (2018-04-02)¶

Bug fix related to settings script creation
Bug fix related to distorted sampling values on Optimizer Studio exit

v1.0 (2018-03-29)¶

Initial version