Messages in this thread | | | Date | Thu, 25 Aug 2005 09:07:17 -0400 | From | Ray Fucillo <> | Subject | Re: process creation time increases linearly with shmem |
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Nick Piggin wrote: > fork() can be changed so as not to set up page tables for > MAP_SHARED mappings. I think that has other tradeoffs like > initially causing several unavoidable faults reading > libraries and program text. > > What kind of application are you using?
The application is a database system called Caché. We allocate a large shared memory segment for database cache, which in a large production environment may realistically be 1+GB on 32-bit platforms and much larger on 64-bit. At these sizes fork() is taking hundreds of miliseconds, which can become a noticeable bottleneck for us. This performance characteristic seems to be unique to Linux vs other Unix implementations.
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