Re: Qmail throughput

[Jim Arnott]

All,

Thanks for all your help and pointers. Looks like its the disk bandwith. When I
take out the fsync's in qmail-queue it drops down to 24 seconds (41.6/sec).

SUMMARY:

Could only inject a 1000 byte file into the queue at a rate of 13.6/sec.
On a ~433 Alpha with Digital UNIX 4.0.

CONCLUSION:

The queue is very disk intensive and all writes are fsync'ed.

Things to try: 

(thanks to David Dyer-Bennet,Daemeon Reiydelle, [EMAIL PROTECTED], 
[EMAIL PROTECTED])

        Remove the fsync call in qmail-queue.c
        Use a battery backed ram drive.
        Send directly before queing and queue those that fail (does qmail 
support this)
        Performance tune the system
        SCSI controller with write-back cache 
        Run qmail-queue directly (qmail-queue does the fsync's though)

thanks again,
Jim Arnott