Re: Default backend and thread backends?

Eh, 'other seven CPU:s'.

/ Per Hedbor ()

Previous text:

2004-02-03 12:33: Subject: Re: Default backend and thread backends?

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But of course. Consider, however, a eight CPU system, where the other four CPU:s also have LOCK# high. You then have to wait for at least 7 memory latency delays, which is almost forever with modern CPU:s.

Also, the memory access that is accompanied by LOCK tends to involve physical RAM, not cache (since reading the data from the processor local cache would defeat the purpose), which on a P4 takes _at least_ 200 cycles.

Now, consider having a LOCK for each reference count change in pike (this is basically what hubbe implemented). You get severe slowdowns.

/ Per Hedbor ()