Olivier Guilyardi wrote: i don't really understand the finer points of this discussion, but hey it's always great to join a technical thread. my favourite bikeshed color is yellow :-D ok, here comes the result for a single-cpu athlon64 4000+ in 64bit mode. nettings@kleineronkel:/build/rbtest> make test gcc -Wall -I. -I./jack -lpthread -o test-int-array-jack \ test-int-array.c jack/ringbuffer.c test-int-array.c: In function ‘main’: test-int-array.c:101: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ gcc -Wall -I. -I./portaudio -lpthread -o test-int-array-portaudio \ test-int-array.c portaudio/ringbuffer.c portaudio/pa_ringbuffer.c test-int-array.c: In function ‘main’: test-int-array.c:101: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ gcc -Wall -I. -I./portaudio -lpthread -o test-int-array-portaudio-nobarrier \ -DNO_MEMORY_BARRIER \ test-int-array.c portaudio/ringbuffer.c portaudio/pa_ringbuffer.c test-int-array.c: In function ‘main’: test-int-array.c:101: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ ./alltests.sh Starting ringbuffer tests (buffer size: 512) === Jack ringbuffer test === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 49536 != 49408 at offset 0 failure in chunk 330502 === Portaudio ringbuffer test === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 Success === Portaudio ringbuffer test (without memory barriers) === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 Success -- jörn nettingsmeier home://germany/45128 essen/lortzingstr. 11/ http://spunk.dnsalias.org phone://+49/201/491621 Kurt is up in Heaven now.