<div dir="ltr">Hello,<div><br></div><div>Any insights on why incrementally(local checkpoints) dumping a fewer number of pages are taking longer time. The checkpoint images are all stored on ramfs(DRAM, no swap as well) based directories. The details are below. Thanks</div><div><br></div><div>Regards</div><div>Ranjan</div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, May 23, 2018 at 10:58 PM Ranjan Sarpangala Venkatesh &lt;<a href="mailto:ranjansv@gmail.com">ranjansv@gmail.com</a>&gt; wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi,<div><br></div><div>Following are the statistics collected while creating incremental dumps of an application using</div><div><br></div><div>criu dump --tree $PID --images-dir ./checkpoints/$i/ --leave-running -vvv -o dump.log</div><div><br></div><div>Dump 1, <span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">&quot;pages_written&quot;: 2832, <span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">&quot;memwrite_time&quot;: 11743,</span></span></div><div><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Dump 2, <span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span> </span>&quot;pages_written&quot;: 2034, <span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">&quot;memwrite_time&quot;: 45700,</span></span></span></span></div><div><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></span></span></span></div><div><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Dump 2 takes much longer while writing less number of pages. Is this due to behavior of splice(). Custom kernel version based on 4.10.0. Any insights would be helpful. Thanks</span></span></span></span></div><div><div><br></div><div><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">$crit show 1/stats-dump</span><br></div><div><div>{   </div><div>    &quot;magic&quot;: &quot;STATS&quot;,</div><div>    &quot;entries&quot;: [</div><div>        {   </div><div>            &quot;dump&quot;: {</div><div>                &quot;freezing_time&quot;: 273,</div><div>                &quot;frozen_time&quot;: 24271,</div><div>                &quot;memdump_time&quot;: 14884,</div><div>               <span style="background-color:rgb(255,255,0)"> &quot;memwrite_time&quot;: 11743,</span></div><div>                &quot;pages_scanned&quot;: 9566,</div><div>                &quot;pages_skipped_parent&quot;: 0,</div><div>                <span style="background-color:rgb(255,255,0)">&quot;pages_written&quot;: 2832,</span></div><div>                &quot;irmap_resolve&quot;: 0</div><div>            }</div><div>        }</div><div>    ]</div><div>}</div></div><div><br></div><div>$crit show 2/stats-dump<br></div><div><div>{   </div><div>    &quot;magic&quot;: &quot;STATS&quot;,</div><div>    &quot;entries&quot;: [</div><div>        {   </div><div>            &quot;dump&quot;: {</div><div>                &quot;freezing_time&quot;: 122,</div><div>                &quot;frozen_time&quot;: 55545,</div><div>                &quot;memdump_time&quot;: 49705,</div><div>                <span style="background-color:rgb(255,255,0)">&quot;memwrite_time&quot;: 45700,</span></div><div>                &quot;pages_scanned&quot;: 5873,</div><div>                &quot;pages_skipped_parent&quot;: 0,</div><div>                <span style="background-color:rgb(255,255,0)">&quot;pages_written&quot;: 2034,</span></div><div>                &quot;irmap_resolve&quot;: 0</div><div>            }</div><div>        }</div><div>    ]</div><div>}</div></div></div><div><br></div><div>Regards</div><div>Ranjan</div></div></blockquote></div>