Hi Daniel, Thank you so much for your help. But, for all the benchmarks the performance (based on "system.cpu.numCycles" and "system.cpu.committedInsts" in stats file) of both BDI and uncompressed are the same for me. Actually, all the metrics of cpu in the stats file are same for both of them. Do you know why it happens for me due to different miss rate for L2 cache?
Many Thanks again! Best, Pooneh On Thu, May 23, 2019 at 6:58 AM Daniel Carvalho <oda...@yahoo.com.br> wrote: > Hello Pooneh, > > You can check papers that discuss turning on and off compression (among > others), for common explanations of the negative influence of compression > in some workloads. Here is an extract of one of my simulation results both > for mcf and geo mean of all SPEC 2017 benchmarks: > > BDI on L3 > system.switch_cpus.ipc > 0.309029 # IPC: Instructions Per Cycle - 505.mcf_r > system.switch_cpus.ipc > 0.829107 # IPC: Instructions Per Cycle - Geo mean > > Uncompressed > system.switch_cpus.ipc > 0.310797 # IPC: Instructions Per Cycle - 505.mcf_r > system.switch_cpus.ipc > 0.823940 # IPC: Instructions Per Cycle - Geo mean > > As you can see, even though compression has a negative impact on the IPC > in mcf, overall it can generate improvements (similar results are seen > for the miss rate). > > Regards, > Daniel > Em quarta-feira, 22 de maio de 2019 05:50:22 GMT+2, Pooneh Safayenikoo < > poneh.saf...@gmail.com> escreveu: > > > Hi, > > I want to apply BDI compression on the L2 cache. So, I changed the config > file for the caches (gem5/configs/common/Caches.py) like following: > > class L1Cache(Cache): > tags = BaseSetAssoc() > compressor = NULL > class L2Cache(Cache): > tags = CompressedTags() > compressor = BDI() > > After that, I got the results for some SPEC benchmarks (I used a > configuration like BDI paper) to compare the L2 miss rate between this > compression and baseline (without applying BDI and CompressedTags). > But, miss rate increases a little for some benchmarks (like mcf and bzip). > Why BDI has higher L2 miss rate? I cannot make sense of it. > > Many thanks for any help! > > Best, > Pooneh >
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