<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>I am seeing this funny situation which I did not see on 1.0.6 and 1.0.8. Some background:</DIV>
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<DIV>machine : INTEL 4Xcore 2</DIV>
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<DIV>running mpiexec -n 4</DIV>
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<DIV>machine has 32G of mem. </DIV>
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<DIV>when my application runs, almost all memory are used. However, there is no swapping.</DIV>
<DIV>I have exclusive use of the machine, so contention is not an issue.</DIV>
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<DIV>issue #1 : processes take extra long to be initialized, compared to 1.0.6</DIV>
<DIV>issue #2 : during the run, at time all of them will become idle at the same time, for almost a</DIV>
<DIV> minute. We never observed this with 1.0.6</DIV>
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<DIV>The codes are the same, only linked with different versions of MPICH2.</DIV>
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<DIV>MPICH2 was built with --enable-threads=multiple for 1.1. without for 1.0.6 or 1.0.8</DIV>
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<DIV>MPI calls are all in the main application thread. I used only 4 MPI functions :</DIV>
<DIV>init(), Send(), Recv() and Barrier(). </DIV>
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<DIV>any suggestion ?</DIV>
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<DIV>thanks</DIV>
<DIV>tan</DIV>
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