diff options
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]] |