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Commit Graph

Author	SHA1	Message	Date
Theodore Leblond	76e7c8a7ed	compat/poll: sleep 1 millisecond to avoid busy wait SwitchToThread() only gives away the rest of the current time slice to another thread in the current process. So if the thread that feeds the file decscriptor we're polling is not in the current process, we get busy-waiting. I played around with this quite a bit. After trying some more complex schemes, I found that what worked best is to just sleep 1 millisecond between iterations. Though it's a very short time, it still completely eliminates the busy wait condition, without hurting perf. There code uses SleepEx(1, TRUE) to sleep. See this page for a good discussion of why that is better than calling SwitchToThread, which is what was used previously: http://stackoverflow.com/questions/1383943/switchtothread-vs-sleep1 Note that calling SleepEx(0, TRUE) does not solve the busy wait. The most striking case was when testing on a UNC share with a large repo, on a single CPU machine. Without the fix, it took 4 minutes 15 seconds, and with the fix it took just 1:08! I think it's because git-upload-pack's busy wait was eating the CPU away from the git process that's doing the real work. With multi-proc, the timing is not much different, but tons of CPU time is still wasted, which can be a killer on a server that needs to do bunch of other things. I also tested the very fast local case, and didn't see any measurable difference. On a big repo with 4500 files, the upload-pack took about 2 seconds with and without the fix. [jc: this was first accepted in msysgit tree in May 2012 via a pull request and Paolo Bonzini has also accepted the same fix to Gnulib around the same time; see $gmane/247518 for a bit more detail] Signed-off-by: Stepan Kasal <kasal@ucw.cz> Acked-by: Johannes Sixt <j6t@kdbg.org> Acked-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>	11 years ago
Sebastian Schuberth	8453c1259a	Windows: do not redefine _WIN32_WINNT With MinGW runtime version 4.0 this interferes with the previous definition from sdkddkver.h. Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>	11 years ago
Ramsay Jones	1c31596a4b	compat/poll/poll.c: Fix a sparse warning Sparse issues an 'Using plain integer as NULL pointer' warning when passing the constant '0' as the second parameter in the call to the WSAEventSelect() function. The function parameter has a pointer type (WSAEVENT, aka HANDLE, aka void *) so that, in order to suppress the warning, we simply pass NULL for that parameter in the function call expression. Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>	12 years ago
Joachim Schmitz	a6772946a5	make poll() work on platforms that can't recv() on a non-socket This way it just got added to gnulib too the other day. Signed-off-by: Joachim Schmitz <jojo@schmitz-digital.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>	12 years ago
Joachim Schmitz	32fde6575e	poll() exits too early with EFAULT if 1st arg is NULL If poll() is used as a milli-second sleep, like in help.c, by passing a NULL in the 1st and a 0 in the 2nd arg, it exits with EFAULT. As per Paolo Bonzini, the original author, this is a bug and to be fixed Like in this commit, which is not to exit if the 2nd arg is 0. It got fixed In gnulib in the same manner the other day. Signed-off-by: Joachim Schmitz <jojo@schmitz-digital.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>	12 years ago
Joachim Schmitz	98c573a902	fix some win32 specific dependencies in poll.c In order for non-win32 platforms to be able to use poll.c, #ifdef the inclusion of two header files properly Signed-off-by: Joachim Schmitz <jojo@schmitz-digital.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>	12 years ago
Joachim Schmitz	6d45eb1720	make poll available for other platforms lacking it move poll.[ch] out of compat/win32/ into compat/poll/ and adjust Makefile with the changed paths. Adding comments to Makefile about how/when to enable it and add logic for this Signed-off-by: Joachim Schmitz <jojo@schmitz-digital.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>	12 years ago
Erik Faye-Lund	f0bd664977	compat/win32/poll.c: upgrade from upstream poll.c is updated from revision adc3a5b in git://git.savannah.gnu.org/gnulib.git The changes are applied with --whitespace=fix to reduce noise. poll.h is not upgraded, because the most recent version now contains template-stuff that breaks compilation for us. Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>	13 years ago
Erik Faye-Lund	0f77dea9a8	mingw: move poll out of sys-folder Both XSI and upstream Gnulib versions expects to find poll.h at the root of some include path, not inside the sys-folder. This helps us when upgrading Gnulib. Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>	13 years ago
Ramsay Jones	56fb3ddc89	msvc: Fix compilation errors in compat/win32/sys/poll.c The msvc winsock2.h header file conditionally defines or declares poll() related symbols which cause many macro redefinition errors, a struct type redefinition error and syntax errors. These symbols are defined in support of the WSAPoll() API, new in Windows Vista, when the symbol _WIN32_WINNT is defined and _WIN32_WINNT >= 0x0600. In order to avoid the compilation errors, we set _WIN32_WINNT to 0x0502 (which would target Windows Server 2003) prior to including the winsock2.h header file. Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Acked-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>	14 years ago
Erik Faye-Lund	fdc1211463	mingw: use poll-emulation from gnulib Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>	14 years ago
Erik Faye-Lund	49521af8a8	mingw: import poll-emulation from gnulib copy lib/poll.c and lib/poll.in.h verbatim from commit 0a05120 in git://git.savannah.gnu.org/gnulib.git to compat/win32/sys/poll.[ch] To upgrade this code in the future, branch out from this commit, copy new versions of the files above on top, and merge back the result. Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>	14 years ago

7 Commits (d8cd32792a0a8a52ff4f5f4bb74f9044bcb9a97a)