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The peak RSS does not tell you how much memory the matrix takes. It may include many things such as the binary, the libraries linked to it, and stack and heap memory.

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<div class="">Hong (Mr.)<br class="">

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<div class="">On Apr 24, 2017, at 9:46 AM, D D <<a href="mailto:driver.dan12@yahoo.com" class="">driver.dan12@yahoo.com</a>> wrote:</div>

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<div id="yui_3_16_0_ym19_1_1493033032302_14257" class="">Hello,</div>

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<div id="yui_3_16_0_ym19_1_1493033032302_13789" class="">I see memory usage that confuses me:</div>

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<div dir="ltr" id="yui_3_16_0_ym19_1_1493033032302_15260" class="">me@blah:src$ ./example1 -n_row 200 -n_col 2000 -sparsity 0.03 -mat_type mpidenseInitialize<br id="yui_3_16_0_ym19_1_1493033032302_14304" class="">

Got options<br id="yui_3_16_0_ym19_1_1493033032302_14305" class="">

Create and assemble matrix<br id="yui_3_16_0_ym19_1_1493033032302_14306" class="">

Assembled<br id="yui_3_16_0_ym19_1_1493033032302_14307" class="">

Peak RSS 21 Mb<br id="yui_3_16_0_ym19_1_1493033032302_14308" class="">

me@blah:~/src$ ./example1 -n_row 200 -n_col 2000 -sparsity 0.03 -mat_type mpiaij<br id="yui_3_16_0_ym19_1_1493033032302_14309" class="">

Initialize<br id="yui_3_16_0_ym19_1_1493033032302_14310" class="">

Got options<br id="yui_3_16_0_ym19_1_1493033032302_14311" class="">

Create and assemble matrix<br id="yui_3_16_0_ym19_1_1493033032302_14312" class="">

Assembled<br id="yui_3_16_0_ym19_1_1493033032302_14313" class="">

Peak RSS 19 Mb<br id="yui_3_16_0_ym19_1_1493033032302_14314" class="">

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<div dir="ltr" id="yui_3_16_0_ym19_1_1493033032302_13786" class="">I put my example code on Github so I can more effectively communicate my question. And here is my question: why does the program as written use so much memory for the sparse case - matrix type

 mpiaij? Note that I'm creating a random dense matrix with at most 3% non-zero entries since this is my use case.<br class="">

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<div dir="ltr" id="yui_3_16_0_ym19_1_1493033032302_15697" class="">I have read the relevant portions of the user's manual and searched for answers. Have I missed a resource that can answer my question?</div>

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<div dir="ltr" id="yui_3_16_0_ym19_1_1493033032302_15737" class=""><a href="https://github.com/dtsmith2001/hpc" class="enhancr2_091ed883-8ee2-c9df-4955-6e64f88122d6" id="yui_3_16_0_ym19_1_1493033032302_16258">dtsmith2001/hpc</a><br class="">

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dtsmith2001/hpc</h2>

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hpc - High Performance Computing Explorations using PETSc and SLEPc</div>

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<div id="yui_3_16_0_ym19_1_1493033032302_16243" class="">Dale</div>

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