Em 21-05-2014 22:53, Michael Baker escreveu:
I've added a VAO and reduced the inner loop to only a call to glDrawArrays which renders 8000 triangles (24000 vertices). The gameFrame function now benchmarks at ~86ms on my machine. I would expect it to be ~16ms because of vsync. I've pared down the entire project into this buildable cabal project of three files, most of which is OpenGL boilerplate: https://github.com/MichaelBaker/haskell-opengl. Running it benchmarks the problem area. For what it's worth, I also tried using glBufferSubData to update the vertex data, but that had no effect.
Your program is segfaulting for me on Linux: $ cabal clean $ cabal configure --disable-executable-stripping --ghc-option=-debug [...] $ cabal build [...] $ LC_ALL=C valgrind ./dist/build/opengl/opengl ==21335== Memcheck, a memory error detector ==21335== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al. ==21335== Using Valgrind-3.9.0 and LibVEX; rerun with -h for copyright info ==21335== Command: ./dist/build/opengl/opengl ==21335== warming up estimating clock resolution... mean is 38.15961 us (20001 iterations) found 583 outliers among 19999 samples (2.9%) 328 (1.6%) high mild 254 (1.3%) high severe estimating cost of a clock call... mean is 1.177577 us (66 iterations) found 3 outliers among 66 samples (4.5%) 2 (3.0%) high mild 1 (1.5%) high severe benchmarking gameFrame ==21335== Invalid read of size 8 ==21335== at 0x4C2CB30: memcpy@GLIBC_2.2.5 (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==21335== by 0x5C1E1A4: ??? (in /usr/lib/nvidia/libGL.so.337.19) ==21335== by 0x5DC2: ??? ==21335== by 0xFF2FFFFFFFF: ??? ==21335== by 0xFEF: ??? ==21335== by 0xFEF: ??? ==21335== by 0xAC4285F: ??? ==21335== by 0x5EF4BB5: _XSend (in /usr/lib/libX11.so.6.3.0) ==21335== by 0xAE456DF: ??? ==21335== by 0xAE460A7: ??? ==21335== by 0x5DC2F: ??? ==21335== by 0xAE455EF: ??? ==21335== Address 0xfe8 is not stack'd, malloc'd or (recently) free'd ==21335== ==21335== ==21335== Process terminating with default action of signal 11 (SIGSEGV) ==21335== Access not within mapped region at address 0xFE8 ==21335== at 0x4C2CB30: memcpy@GLIBC_2.2.5 (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==21335== by 0x5C1E1A4: ??? (in /usr/lib/nvidia/libGL.so.337.19) ==21335== by 0x5DC2: ??? ==21335== by 0xFF2FFFFFFFF: ??? ==21335== by 0xFEF: ??? ==21335== by 0xFEF: ??? ==21335== by 0xAC4285F: ??? ==21335== by 0x5EF4BB5: _XSend (in /usr/lib/libX11.so.6.3.0) ==21335== by 0xAE456DF: ??? ==21335== by 0xAE460A7: ??? ==21335== by 0x5DC2F: ??? ==21335== by 0xAE455EF: ??? ==21335== If you believe this happened as a result of a stack ==21335== overflow in your program's main thread (unlikely but ==21335== possible), you can try to increase the size of the ==21335== main thread stack using the --main-stacksize= flag. ==21335== The main thread stack size used in this run was 8388608. ==21335== ==21335== HEAP SUMMARY: ==21335== in use at exit: 1,222,944 bytes in 665 blocks ==21335== total heap usage: 5,445 allocs, 4,780 frees, 78,290,922 bytes allocated ==21335== ==21335== LEAK SUMMARY: ==21335== definitely lost: 10,752 bytes in 12 blocks ==21335== indirectly lost: 0 bytes in 0 blocks ==21335== possibly lost: 519,934 bytes in 2 blocks ==21335== still reachable: 692,258 bytes in 651 blocks ==21335== suppressed: 0 bytes in 0 blocks ==21335== Rerun with --leak-check=full to see details of leaked memory ==21335== ==21335== For counts of detected and suppressed errors, rerun with: -v ==21335== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 3 from 2) Falha de segmentação (imagem do núcleo gravada) $ gdb ./dist/build/opengl/opengl GNU gdb (GDB) 7.7.1 [...] Reading symbols from ./dist/build/opengl/opengl...(no debugging symbols found)...done. (gdb) run Starting program: /tmp/haskell-opengl/dist/build/opengl/opengl warning: Could not load shared library symbols for linux-vdso.so.1. Do you need "set solib-search-path" or "set sysroot"? [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". warming up estimating clock resolution... mean is 1.346329 us (640001 iterations) found 4071 outliers among 639999 samples (0.6%) 3860 (0.6%) high severe estimating cost of a clock call... mean is 81.51352 ns (10 iterations) found 1 outliers among 10 samples (10.0%) 1 (10.0%) high mild benchmarking gameFrame Program received signal SIGSEGV, Segmentation fault. 0x00007ffff5c5ece0 in _wordcopy_fwd_aligned () from /usr/lib/libc.so.6 (gdb) bt #0 0x00007ffff5c5ece0 in _wordcopy_fwd_aligned () from /usr/lib/libc.so.6 #1 0x00007ffff5c595f5 in __memmove_sse2 () from /usr/lib/libc.so.6 #2 0x00007ffff6dff1a5 in ?? () from /usr/lib/libGL.so.1 #3 0x00007ffff6e01ada in ?? () from /usr/lib/libGL.so.1 #4 0x0000000000407b91 in ceGc_info () #5 0x0000000000000000 in ?? () Cheers, -- Felipe.