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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] Debian 7.8.0 SPARC64 on qemu - anything i can do to speedup the emulation? |
Date: | Fri, 21 Aug 2015 08:47:52 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 |
On 08/20/2015 11:05 PM, Dennis Luehring wrote: >> > g++ src/pugixml.cpp -g -Wall -Wextra -Werror -pedantic -std=c++0x -c -MMD >> > -MP >> > >> > tcg-indirect: ~2:46.5 >> > qemu.org-git: ~2:51.2 (worst result) >> > without-optimization: ~2:14.1 (best result) >> >> No compiler optimization? I wouldn't expect there to be much for tcg to >> optimize there -- dropping values to memory all the time doesn't leave much. > > > without-optimization means qemu.org-git release build + undefine > USE_TCG_OPTIMIZATIONS in tcg/tcg.c > or what compiler do you mean? The one for compiling the benchmark: g++ -O2. >> These results are weird. Unoptimized less than half the speed of mainline? >> Improving optimization (with no extra work, mind) brings the results back >> down? > > > yep they are - it seems that the assumption of the involved developers > where speed can be improved / or slowbess comes from is not correct > how are SPARC64 benchmarks done usually? *shrug* No different than any other... r~
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