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Re: Thread model (was: Ext2 superblock fault)
From: |
Samuel Thibault |
Subject: |
Re: Thread model (was: Ext2 superblock fault) |
Date: |
Tue, 11 Mar 2008 11:19:32 +0000 |
User-agent: |
Mutt/1.5.12-2006-07-14 |
Hello,
olafBuddenhagen@gmx.net, le Tue 11 Mar 2008 04:53:45 +0100, a écrit :
> [I] suggested a more adaptive approach: Keep track of the existing
> threads, and if none of them makes progress in a certain amount of
> time (say 100 ms), allow creating some more threads. But that was
> never implemented. Also, it still might cause considerable delays in
> some situations; and I'm not even sure it would fix all problems. (I
> didn't fully understand the problem discussed in this thread, so I
> don't know whether it would be fixed by that?)
The problem I was observing is when you have a sync_all which triggers
the write of a lot of files, but unfortunately the superblock was paged
out, so that you aren't able to start another thread to reload it.
Whatever the thresholds you choose, with a big enough load you will
still have the problem of resisting to creating enough threads for all
these request, plus one for the superblock reload request.
Samuel
- Re: Thread model, (continued)
- Re: Thread model, olafBuddenhagen, 2008/03/19
- Re: Thread model, Thomas Bushnell BSG, 2008/03/20
- Re: Thread model, olafBuddenhagen, 2008/03/17
- Re: Thread model, Neal H. Walfield, 2008/03/17
- Re: Thread model, olafBuddenhagen, 2008/03/18
- Re: Thread model, Thomas Bushnell BSG, 2008/03/19
- Re: Thread model, olafBuddenhagen, 2008/03/19
- Re: Thread model (was: Ext2 superblock fault),
Samuel Thibault <=
- Re: Thread model (was: Ext2 superblock fault), olafBuddenhagen, 2008/03/17
- Re: Thread model (was: Ext2 superblock fault), Samuel Thibault, 2008/03/17
- Re: Thread model (was: Ext2 superblock fault), olafBuddenhagen, 2008/03/18
- Re: Thread model (was: Ext2 superblock fault), Samuel Thibault, 2008/03/19
- Re: Thread model (was: Ext2 superblock fault), Michal Suchanek, 2008/03/19
- Re: Thread model (was: Ext2 superblock fault), Samuel Thibault, 2008/03/19
- Re: Thread model (was: Ext2 superblock fault), olafBuddenhagen, 2008/03/19
- Re: Thread model (was: Ext2 superblock fault), Thomas Bushnell BSG, 2008/03/17
- Re: Thread model (was: Ext2 superblock fault), Samuel Thibault, 2008/03/17