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Re^3: problem of my multithreading perl script

by BrowserUk (Pope)
on Jan 11, 2013 at 19:17 UTC ( #1012959=note: print w/replies, xml ) Need Help??


in reply to Re^2: problem of my multithreading perl script
in thread problem of my multithreading perl script

Take a look at an SSD review.

Note how the random 4k reads achieves a relatively low throughput (101.4MB/s in that particular case), whereas the throughput for sequential reads is considerably higher (431.8MB/s).

This is a common factor with all SSDs. Much faster than spinning rust, but it is still considerably faster to read a file sequentially than randomly.

If you are reading 12 files sequentially, concurrently, you are reading 4K blocks randomly from the viewpoint of the controller.


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choroba played with the band on Saturday, so Sunday was very sleepy
[choroba]: managed to release Syntax::Construct with 5.28 support in the night, though
[Corion]: choroba: Whee ;)
[Corion]: marto: Ouch - I would've thought that kids adapt much better, but that's obviously not the case...
[marto]: well, their mother let them sleep till 15:00 & 12:00 last week, which didn't help them adjust :P
[Corion]: I was "productive" over the weekend in the sense that I revived my old "Perlmonks on SQLite" code, which likely means I can get a test instance back up running on my webhost. Small steps :)
[Corion]: marto: Ow, no, that doesn't help at all :)
[choroba]: Related to the new release, anyone could explain this or this tester report?
[Discipulus]: hello crew! marto thanks for the message: but I how can I help? i'm testing cpan Padre atm problem with Client::Debug
[choroba]: I don't happen to have 5.10.0 nor 5.8.5 handy...

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