Re: High bandwidth disk management techniques
Re: High bandwidth disk management techniques
- Subject: Re: High bandwidth disk management techniques
- From: Craig Hansen-Sturm <email@hidden>
- Date: Wed, 4 May 2005 15:27:15 -0700
and one thread per file (i.e., to avoid async disk I/O).
Obviously, the first part of this has changed. What about async
disk I/O vs. threads?
I also believe that synchronous I/O (one thread per *device*) will
outperform async. Fewer user<->kernel transitions. Consider what
happens when a read completes in the two scenarios...
Testing has shown that this is definately the case. Also, note there
is a global lock (an i/o "funnel") taken on each i/o submission. In
effect, everything is serialized for the single hw volume case anyway.
--craig
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