Hi, Here you go...
--- old 2009-09-08 17:47:41.000000000 +0300 +++ new 2009-09-08 17:47:31.000000000 +0300 @@ -1,38 +1,45 @@ -tune2fs 1.40-WIP (14-Nov-2006) -Filesystem volume name: / +tune2fs 1.41.3 (12-Oct-2008) +Filesystem volume name: <none> Last mounted on: <not available> -Filesystem UUID: 5a1d4aa2-a4e8-48a5-b80d-03dbcebb2a4c +Filesystem UUID: 466838ce-735c-4523-9941-ecab400e22c4 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) -Filesystem features: has_journal filetype needs_recovery sparse_super -Filesystem flags: signed directory hash +Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file +Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux -Inode count: 9584640 -Block count: 19153488 -Reserved block count: 957674 -Free blocks: 16844413 -Free inodes: 9328387 +Inode count: 9601024 +Block count: 38399358 +Reserved block count: 1919967 +Free blocks: 37358729 +Free inodes: 9551984 First block: 0 Block size: 4096 Fragment size: 4096 +Reserved GDT blocks: 1014 Blocks per group: 32768 Fragments per group: 32768 -Inodes per group: 16384 +Inodes per group: 8192 Inode blocks per group: 512 -Last mount time: Sun Jun 14 14:00:14 2009 -Last write time: Sun Jun 14 14:00:14 2009 -Mount count: 17 -Maximum mount count: 30 -Last checked: Sun Jan 20 17:04:43 2008 -Check interval: 0 (<none>) +Filesystem created: Wed Aug 12 14:18:23 2009 +Last mount time: Tue Sep 8 09:08:05 2009 +Last write time: Tue Sep 8 09:08:05 2009 +Mount count: 3 +Maximum mount count: 20 +Last checked: Fri Sep 4 18:46:20 2009 +Check interval: 15552000 (6 months) +Next check after: Wed Mar 3 17:46:20 2010 Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 -Inode size: 128 +Inode size: 256 +Required extra isize: 28 +Desired extra isize: 28 Journal inode: 8 -First orphan inode: 2097564 +First orphan inode: 3777224 +Default directory hash: half_md4 +Directory Hash Seed: 8998eea4-7d31-437f-bf0b-a12c3dc853ab Journal backup: inode blocks 2009/9/8 Arie Skliarouk <[email protected]> > Hi, > > Interesting riddle... > > 2009/9/8 Noam Rathaus <[email protected]> > >> The most notable difference is the read time on files (new HD) >> 0.047210 read(7, " <= 0)\n {\n $numLimit = 10;\n }\n\n "..., 4096) >> >> Instead of (old HW) >> 0.001462 read(6, "owItem = $1;\n\n my $RowItems = $s"..., 4096) = 4096 >> >> That is 40 times slower (it is the same file being opened) >> > > What is the filesystem used on the machines? Do they have similar mount > flags (no_atime or such)? > If both are ext2/3, compare "tune2fs -l /dev/sda1" on them. > Try to mount both filesystems using noatime and compare timings then. > > Full disk might affect fragmentation or placement of the files and thus > require long seeks. As atime needs to be updated (or journal log), buffering > in memory would not help. > Test write speed of the disks. > > -- > Arie > >> >> I have no idea why there is such a difference >> >> hdparm on the old: >> hdparm -t /dev/sda >> >> /dev/sda: >> Timing buffered disk reads: 190 MB in 3.02 seconds = 62.87 MB/sec >> >> hdparm on the new: >> # hdparm -t /dev/sda >> >> /dev/sda: >> Timing buffered disk reads: 314 MB in 3.01 seconds = 104.22 MB/sec >> >> On Tue, Sep 8, 2009 at 3:02 PM, Noam Meltzer <[email protected]> wrote: >> >>> Did you try to check with strace ? >>> >>> 2009/9/8 Noam Rathaus <[email protected]> >>> >>>> Hi, >>>> >>>> >>>> I have two machines, their hardware is not identical, but their >>>> installation is. >>>> >>>> One is a 3 years old DELL server, while the other is a 1 year old >>>> server. >>>> >>>> One is running 2.6.26-2-686 while the other 2.6.30-1-686 >>>> >>>> What I am seeing is slow startup - emphasis on startup, the code works >>>> fast once its running - of perl scripts >>>> >>>> Even the smallest perl script such as this: >>>> === >>>> #!/usr/bin/perl >>>> >>>> use lib '/usr/local/MySystem/lib'; >>>> >>>> use DB; >>>> >>>> === >>>> >>>> Take 7 seconds to start, in comparison to 0.030secods >>>> >>>> If I don't use the "use DB;" which my package >>>> >>>> It loads fast >>>> >>>> I am trying to figure out why, I checked the HD speeds via hdparam, the >>>> newer server is 1.5 times faster 103MB/sec >>>> >>>> I tried to see what libraries were being used, used strace, but I can't >>>> see something "big" that is causing the delay. >>>> >>>> The "use DB;" can be replaced with any other "custom" library package I >>>> wrote, they all take 2-7 seconds to load, while on the other machine it >>>> takes negligible time >>>> >>>> Does someone have a "thread" to cling to? >>>> >>>> Thanks, >>>> Noam Rathaus >>>> >>>> _______________________________________________ >>>> Linux-il mailing list >>>> [email protected] >>>> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >>>> >>>> >>> >> >> _______________________________________________ >> Linux-il mailing list >> [email protected] >> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >> >> > > _______________________________________________ > Linux-il mailing list > [email protected] > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > >
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