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Subject: Re: [Boost-users] [interprocess] Shared memory object
From: Davies, John (john.davies_at_[hidden])
Date: 2014-02-21 16:28:22


>From my reading, the Windows version is faster but it doesn't have the persistence as the Linux version. The description mentions this:

A class that wraps the native Windows shared memory that is implemented as a file mapping of the paging file. Unlike shared_memory_object<http://www.boost.org/doc/libs/1_55_0/doc/html/boost/interprocess/shared_memory_object.html>, windows_shared_memory<http://www.boost.org/doc/libs/1_55_0/doc/html/boost/interprocess/windows_shared_memory.html> has no kernel persistence and the shared memory is destroyed when all processes destroy all their windows_shared_memory<http://www.boost.org/doc/libs/1_55_0/doc/html/boost/interprocess/windows_shared_memory.html> objects and mapped regions for the same shared memory or the processes end/crash.

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From: Boost-users [mailto:boost-users-bounces_at_[hidden]] On Behalf Of Patrick Steele
Sent: Thursday, February 20, 2014 11:40 AM
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] [interprocess] Shared memory object

Tests at the time were showing the Windows version to operate about twice as fast. If nothing has changed I guess I will remain with it then. I had just been hoping for the code to be more platform dependent.

On 20 February 2014 14:44, Ion Gaztañaga <igaztanaga_at_[hidden]<mailto:igaztanaga_at_[hidden]>> wrote:
El 20/02/2014 11:42, Patrick Steele escribió:

Hi,
can anyone tell me if there is a performance or other difference between
boost::interprocess::shared_memory_object and
boost::interprocess::windows_shared_memory? With the version of boost we
were using back in 2011 ( boost 1.48 ), we found that
windows_shared_memory operated faster than shared_memory_object when
transporting around 10MB of data. Is this still the case?
Thanks,

Nothing has changed AFAIK. shared_memory_object is a memory mapped file whereas windows_shared_memory is backed by the pagefile. I don't know why Windows should make one faster than the other, though.

Best,

Ion
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