[revServer] process timeout issue

Richard Gaskin ambassador at fourthworld.com
Fri Aug 6 12:49:22 CDT 2010


Jim Ault wrote:
> Most log file logic is to add new transactions to the end of an
> existing file, thus 2 Mb requires more time than 100K.  Some servers
> start new log files every calendar day, but others may have a much
> lower frequency.

Limiting unnecessary frequency is useful for many reasons, but with 
regard to logs I was just running some experiments last night using 
"open file <filename> for append" and it seems that with the append 
option the time to write is independent of the original file size; it 
seems to operate like the seek command in that regard.

In my tests I was running 10,000 iterations, in which each one created a 
string 1k long and wrote it to the file after the file had been opened 
for append.  Along the way, every 1000 times through the loop it gets 
the elapsed time since the last 1000 was done, with these results:

385
383
383
384
384
385
386
382
803
383

The second-to-last item spiking is probably just some background 
process; the rest are consistent enough that I've gotten very confident 
about using append for logging.

In fact, I repeated the same test a few times, so each time the data 
file is growing by 10 MBs, and each time the results are roughly the same.

For example, the results above were done when the file was only about 30 
MBs - here are the results when the file is well over 120 MBs:

387
383
383
383
382
383
654
383
383
382

--
  Richard Gaskin
  Fourth World
  Rev training and consulting: http://www.fourthworld.com
  Webzine for Rev developers: http://www.revjournal.com
  revJournal blog: http://revjournal.com/blog.irv



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