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authorcvs2svn <>2014-02-18 19:58:41 +0000
committercvs2svn <>2014-02-18 19:58:41 +0000
commitb5279ecc51ff751ccd052fbb7c20efd529575f7e (patch)
tree64141e96a5d64ae59fb7f410270e4daa41878a03 /winsup/utils/ssp.txt
parenta2a48cb593a9b3cc3f5c63c39f52c32db31cec50 (diff)
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This commit was manufactured by cvs2svn to create tag 'cygwin-pre-user-db'.cygwin-pre-user-db
Sprout from cygwin-1_7_29-release-branchpoint 2014-02-18 19:58:40 UTC cvs2svn 'This commit was manufactured by cvs2svn to create branch 'cygwin-1_7_29' Cherrypick from master 2014-02-08 22:25:11 UTC Corinna Vinschen <corinna@vinschen.de> 'Fix ChangeLog': winsup/cygwin/ChangeLog winsup/cygwin/miscfuncs.cc winsup/cygwin/miscfuncs.h winsup/cygwin/mount.cc Delete: winsup/COPYING winsup/CYGWIN_LICENSE winsup/ChangeLog winsup/Makefile.common winsup/Makefile.in winsup/README winsup/acinclude.m4 winsup/aclocal.m4 winsup/autogen.sh winsup/c++wrap winsup/ccwrap winsup/config.guess winsup/config.sub winsup/configure winsup/configure.ac winsup/configure.cygwin winsup/cygserver/ChangeLog winsup/cygserver/ChangeLog.64bit winsup/cygserver/Makefile.in winsup/cygserver/README winsup/cygserver/aclocal.m4 winsup/cygserver/autogen.sh winsup/cygserver/bsd_helper.cc winsup/cygserver/bsd_helper.h winsup/cygserver/bsd_log.cc winsup/cygserver/bsd_log.h winsup/cygserver/bsd_mutex.cc winsup/cygserver/bsd_mutex.h winsup/cygserver/client.cc winsup/cygserver/configure winsup/cygserver/configure.ac winsup/cygserver/cygserver-config winsup/cygserver/cygserver.cc winsup/cygserver/cygserver.conf winsup/cygserver/msg.cc winsup/cygserver/process.cc winsup/cygserver/process.h winsup/cygserver/sem.cc winsup/cygserver/setpwd.cc winsup/cygserver/shm.cc winsup/cygserver/sysv_msg.cc winsup/cygserver/sysv_sem.cc winsup/cygserver/sysv_shm.cc winsup/cygserver/threaded_queue.cc winsup/cygserver/threaded_queue.h winsup/cygserver/transport.cc winsup/cygserver/transport.h winsup/cygserver/transport_pipes.cc winsup/cygserver/transport_pipes.h winsup/cygserver/woutsup.h winsup/cygwin/release/1.7.29 winsup/doc/.cvsignore winsup/doc/ChangeLog winsup/doc/Makefile.in winsup/doc/README winsup/doc/Wishlist winsup/doc/aclocal.m4 winsup/doc/bodysnatcher.pl winsup/doc/configure winsup/doc/configure.ac winsup/doc/cygserver.xml winsup/doc/cygwin-api.in.xml winsup/doc/cygwin-ug-net.xml winsup/doc/cygwin.xsl winsup/doc/cygwinenv.xml winsup/doc/dll.xml winsup/doc/doctool.c winsup/doc/doctool.txt winsup/doc/effectively.xml winsup/doc/faq-api.xml winsup/doc/faq-copyright.xml winsup/doc/faq-programming.xml winsup/doc/faq-resources.xml winsup/doc/faq-setup.xml winsup/doc/faq-using.xml winsup/doc/faq-what.xml winsup/doc/faq.xml winsup/doc/fhandler-tut.txt winsup/doc/filemodes.xml winsup/doc/fo.xsl winsup/doc/gcc.xml winsup/doc/gdb.xml winsup/doc/highlights.xml winsup/doc/legal.xml winsup/doc/new-features.xml winsup/doc/ntsec.xml winsup/doc/ov-ex-unix.xml winsup/doc/ov-ex-win.xml winsup/doc/overview.xml winsup/doc/pathnames.xml winsup/doc/programming.xml winsup/doc/setup-env.xml winsup/doc/setup-files.xml winsup/doc/setup-locale.xml winsup/doc/setup-maxmem.xml winsup/doc/setup-net.xml winsup/doc/specialnames.xml winsup/doc/textbinary.xml winsup/doc/ug-info.xml winsup/doc/using.xml winsup/doc/windres.xml winsup/doc/xidepend winsup/install-sh winsup/lsaauth/ChangeLog winsup/lsaauth/ChangeLog.64bit 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winsup/utils/cygwin-console-helper.cc winsup/utils/dump_setup.cc winsup/utils/dumper.cc winsup/utils/dumper.h winsup/utils/getconf.c winsup/utils/getfacl.c winsup/utils/kill.cc winsup/utils/ldd.cc winsup/utils/ldh.cc winsup/utils/loadlib.h winsup/utils/locale.cc winsup/utils/minidumper.cc winsup/utils/mkgroup.c winsup/utils/mkpasswd.c winsup/utils/module_info.cc winsup/utils/mount.cc winsup/utils/parse_pe.cc winsup/utils/passwd.c winsup/utils/path.cc winsup/utils/path.h winsup/utils/pldd.c winsup/utils/ps.cc winsup/utils/regtool.cc winsup/utils/setfacl.c winsup/utils/setmetamode.c winsup/utils/ssp.c winsup/utils/ssp.txt winsup/utils/strace.cc winsup/utils/testsuite.cc winsup/utils/testsuite.h winsup/utils/tzset.c winsup/utils/umount.cc winsup/utils/utils.xml winsup/utils/wide_path.h
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-
-SSP - The Single Step Profiler
-
-Original Author: DJ Delorie <dj@redhat.com>
-
-The SSP is a program that uses the Win32 debug API to run a program
-one ASM instruction at a time. It records the location of each
-instruction used, how many times that instruction is used, and all
-function calls. The results are saved in a format that is usable by
-the profiling program "gprof", although gprof will claim the values
-are seconds, they really are instruction counts. More on that later.
-
-Because the SSP was originally designed to profile the cygwin DLL, it
-does not automatically select a block of code to report statistics on.
-You must specify the range of memory addresses to keep track of
-manually, but it's not hard to figure out what to specify. Use the
-"objdump" program to determine the bounds of the target's ".text"
-section. Let's say we're profiling cygwin1.dll. Make sure you've
-built it with debug symbols (else gprof won't run) and run objdump
-like this:
-
- objdump -h cygwin1.dll
-
-It will print a report like this:
-
-cygwin1.dll: file format pei-i386
-
-Sections:
-Idx Name Size VMA LMA File off Algn
- 0 .text 0007ea00 61001000 61001000 00000400 2**2
- CONTENTS, ALLOC, LOAD, READONLY, CODE, DATA
- 1 .data 00008000 61080000 61080000 0007ee00 2**2
- CONTENTS, ALLOC, LOAD, DATA
- . . .
-
-The only information we're concerned with are the VMA of the .text
-section and the VMA of the section after it (sections are usually
-contiguous; you can also add the Size to the VMA to get the end
-address). In this case, the VMA is 0x61001000 and the ending address
-is either 0x61080000 (start of .data method) or 0x0x6107fa00 (VMA+Size
-method).
-
-There are two basic ways to use SSP - either profiling a whole
-program, or selectively profiling parts of the program.
-
-To profile a whole program, just run ssp without options. By default,
-it will step the whole program. Here's a simple example, using the
-numbers above:
-
- ssp 0x61001000 0x61080000 hello.exe
-
-This will step the whole program. It will take at least 8 minutes on
-a PII/300 (yes, really). When it's done, it will create a file called
-"gmon.out". You can turn this data file into a readable report with
-gprof:
-
- gprof -b cygwin1.dll
-
-The "-b" means "skip the help pages". You can omit this until you're
-familiar with the report layout. The gprof documentation explains
-a lot about this report, but ssp changes a few things. For example,
-the first part of the report reports the amount of time spent in each
-function, like this:
-
-Each sample counts as 0.01 seconds.
- % cumulative self self total
- time seconds seconds calls ms/call ms/call name
- 10.02 231.22 72.43 46 1574.57 1574.57 strcspn
- 7.95 288.70 57.48 130 442.15 442.15 strncasematch
-
-The "seconds" columns are really CPU opcodes, 1/100 second per opcode.
-So, "231.22" above means 23,122 opcodes. The ms/call values are 10x
-too big; 1574.57 means 157.457 opcodes per call. Similar adjustments
-need to be made for the "self" and "children" columns in the second
-part of the report.
-
-OK, so now we've got a huge report that took a long time to generate,
-and we've identified a spot we want to work on optimizing. Let's say
-it's the time() function. We can use SSP to selectively profile this
-function by using OutputDebugString() to control SSP from within the
-program. Here's a sample program:
-
- #include <windows.h>
- main()
- {
- time_t t;
- OutputDebugString("ssp on");
- time(&t);
- OutputDebugString("ssp off");
- }
-
-Then, add the "-d" option to ssp to default to *disabling* profiling.
-The program will run at full speed until the first OutputDebugString,
-then step until the second.
-
- ssp -d 0x61001000 0x61080000 hello.exe
-
-You can then use gprof (as usual) to see the performance profile for
-just that portion of the program's execution.
-
-OK, now for the other ssp options, and when to use them:
-
-"-v" - verbose. This prints messages about threads starting and
-stopping, OutputDebugString calls, DLLs loading, etc.
-
-"-t" and "-tc" - tracing. With -t, *every* step's address is written
-to the file "trace.ssp". This can be used to help debug functions,
-since it can trace multiple threads. Clever use of scripts can match
-addresses with disassembled opcodes if needed. Warning: creates
-*huge* files, very quickly. "-tc" prints each address to the console,
-useful for debugging key chunks of assembler.
-
-"-s" - subthreads. Usually, you only need to trace the main thread,
-but sometimes you need to trace all threads, so this enables that.
-It's also needed when you want to profile a function that only a
-subthread calls. However, using OutputDebugString automatically
-enables profiling on the thread that called it, not the main thread.
-
-"-dll" - dll profiling. Generates a pretty table of how much time was
-spent in each dll the program used. No sense optimizing a function in
-your program if most of the time is spent in the DLL.
-
-I usually use the -v, -s, and -dll options:
-
- ssp -v -s -dll -d 0x61001000 0x61080000 hello.exe