Re: [Gems-users] prefetch in opal

[Muhammad abid Mughal <mabidm_pieas@xxxxxxxxx>]

hi,

    Opal implements both hardware(ie next line prefetcher for instruction cache) and software prefetch(prefetch_inst_t).But in ruby you can not differentiate b/w theses two because both prefetches use "PrefetchBit_Yes" when issued to ruby [ see OpalInterface::makePrefetch(....).]

But its easy to differentiate b/w these two.

Regards,

Muhammad abid

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From: Jerry Lin <cosjerry@xxxxxxxxx>
To: Gems Users <gems-users@xxxxxxxxxxx>
Sent: Tuesday, June 29, 2010 19:31:40
Subject: [Gems-users] prefetch in opal

Hello all,
I'm wondering about what kind of prefetching that opal implemented.

I saw Next Line prefetch in opal/system/rubycache.C.

But in ruby's dump file, the prefetch count seems to be the software prefetch.

Is the prefetching policy implemented in opal a HW prefetch or SW prefetch?

Any advice would be appreciated. 

 
Thanks for helping.