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The 'max_dequeue_rate' parameter limits the rate at which messages can be dequeued in a single cycle. When set, 'isReady' returns false if after max_dequeue_rate is reached. This can be used to fine tune the performance of cache controllers. For the record, other ways of achieving a similar effect could be: 1) Modifying the SLICC compiler to limit message consumption in the generated wakeup() function 2) Set the buffer size to max_dequeue_rate. This can potentially cut the the expected throughput in half. For instance if a producer can enqueue every cycle, and a consumer can dequeue every cycle, a message can only be actually enqueued every two (assuming buffer_size=1) since the buffer entries available after dequeue are only visible in the next cycle (even if the consumer executes before the producer). JIRA: https://gem5.atlassian.net/browse/GEM5-920 Change-Id: I3a446c7276b80a0e3f409b4fbab0ab65ff5c1f81 Signed-off-by: Tiago Mück <tiago.muck@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41862 Reviewed-by: Meatboy 106 <garbage2collector@gmail.com> Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.