[fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

[Simon Kissel]

Hi Florian,

> The changes help also on arm and arm can be build using the same
> command line, however, at least on a Raspi3B+ the
> improvement is less significant than on i386 (still the old cache
> flush (?) issue which is outside of the scope of FPC?).

Actually the changes are significant:

Before:

01-00512-00-00016:/opt/viprinet/bin # ./vipribenchmemcache_nodeps_crossfpc
VipriBenchThreaded - RunningTimeSeconds=5, TestCount=100, StartSeq=0, NumberOfChannels=6, BufferPackets=5000, NumberOfSynchroThreads=4
...
Time: 5212ms = 287797 pkts/s = 430 MB/s

After:

01-00512-00-00016:/opt/viprinet/bin # ./vipribenchmemcache_nodeps_armv5te_fpc
VipriBenchThreaded - RunningTimeSeconds=5, TestCount=100, StartSeq=0, NumberOfChannels=6, BufferPackets=5000, NumberOfSynchroThreads=4
....
Time: 5893ms = 339386 pkts/s = 507 MB/s

BR,

Simon

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