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Align inter-thread shared structers on cache-line granularity
Specifically ypipe_t specializations for msg_t and command_t. Currently only supports platforms where posix_memalign is available.
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@ -481,7 +481,7 @@ AM_CONDITIONAL(ON_LINUX, test "x$libzmq_on_linux" = "xyes")
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# Checks for library functions.
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AC_TYPE_SIGNAL
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AC_CHECK_FUNCS(perror gettimeofday clock_gettime memset socket getifaddrs freeifaddrs fork)
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AC_CHECK_FUNCS(perror gettimeofday clock_gettime memset socket getifaddrs freeifaddrs fork posix_memalign)
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AC_CHECK_HEADERS([alloca.h])
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LIBZMQ_CHECK_SOCK_CLOEXEC([
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@ -146,6 +146,10 @@ namespace zmq
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} done;
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} args;
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enum { pad_size = 64 - (sizeof(destination) + sizeof(args)) };
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unsigned char unused[ pad_size ];
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};
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}
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@ -41,8 +41,16 @@ namespace zmq
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// T is the type of the object in the queue.
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// N is granularity of the queue (how many pushes have to be done till
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// actual memory allocation is required).
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#ifdef HAVE_POSIX_MEMALIGN
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// ALIGN is the memory alignment size to use in the case where we have
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// posix_memalign available. Default value is 64, this alignment will
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// prevent two queue chunks from occupying the same CPU cache line on
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// architectures where cache lines are <= 64 bytes (e.g. most things
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// except POWER).
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template <typename T, int N, size_t ALIGN = 64> class yqueue_t
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#else
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template <typename T, int N> class yqueue_t
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#endif
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{
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public:
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@ -103,7 +111,13 @@ namespace zmq
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end_chunk->next = sc;
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sc->prev = end_chunk;
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} else {
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#ifdef HAVE_POSIX_MEMALIGN
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void *pv;
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if (posix_memalign(&pv, ALIGN, sizeof (chunk_t)) == 0)
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end_chunk->next = (chunk_t*) pv;
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#else
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end_chunk->next = (chunk_t*) malloc (sizeof (chunk_t));
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#endif
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alloc_assert (end_chunk->next);
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end_chunk->next->prev = end_chunk;
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}
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