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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2011-09-06 19:35:59 +0200 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2011-09-06 19:35:59 +0200 |
| commit | e0dd25dccb41c987463ba4519fa92f456840cb74 (patch) | |
| tree | 2cfa9b8e3fd4e2e9c00add69acc852515495bd5f /open_issues/performance/io_system | |
| parent | c13fc001dbf8b9da4ebf730761fc7b8c1f017c56 (diff) | |
| parent | 647faa6dd7e286d20171247039bd59600bb7e436 (diff) | |
| download | web-e0dd25dccb41c987463ba4519fa92f456840cb74.tar.gz web-e0dd25dccb41c987463ba4519fa92f456840cb74.tar.bz2 web-e0dd25dccb41c987463ba4519fa92f456840cb74.zip | |
Merge branch 'master' of flubber:~hurd-web/hurd-web
Diffstat (limited to 'open_issues/performance/io_system')
| -rw-r--r-- | open_issues/performance/io_system/binutils_ld_64ksec.mdwn | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn index 79c2300f..359d5fee 100644 --- a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn +++ b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn @@ -33,3 +33,18 @@ the testee shows that (primarily) an ever-repeating series of `io_seek` and `io_read` is being processed. Running the testee on GNU/Linux with strace shows the equivalent thing (`_llseek`, `read`) -- but Linux' I/O system isn't as slow as the Hurd's. + +--- + +IRC, freenode, #hurd, 2011-09-01: + + <youpi> hum, f951 does myriads of 71->io_seek_request (32768 0) = 0 32768 + <youpi> no wonder it's slow + <youpi> unfortunately that's also what it does on linux, the system call is + just less costly + <youpi> apparently gfortran calls io_seek for, like, every token of the + sourced file + <youpi> (fgetpos actually, but that's the same) + <youpi> and it is indeed about 10 times slower under Xen for some reason + +[[!tag open_issue_xen]] |