<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">I have spent more than a decade implementing various versions of Actors systems. Some were along the lines you describe, launching native threads to perform the work of Actors.<div><br></div><div>I finally concluded that, having just run a good race, you ought not kill the race horses, but rather retire them to the stable for another race. IOW, I now use thread pools, permanently launched and waiting for dispatch to another task. Thread startup entails a huge amount of overhead - allocating stack space and CPU registers, registering with OS, etc.</div><div><br></div><div>- DM<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Jan 5, 2024, at 07:32, Taoufik Dachraoui <dachraoui.taoufik@gmail.com> wrote:</div><br class="Apple-interchange-newline"><div><div dir="ltr">why ccl is much slower?<div><br></div><div>taoufik@Ankbot:~/workspace/ccl/actor$ sbcl<br>This is SBCL 2.3.11, an implementation of ANSI Common Lisp.<br>More information about SBCL is available at <<a href="http://www.sbcl.org/">http://www.sbcl.org/</a>>.<br><br>SBCL is free software, provided as is, with absolutely no warranty.<br>It is mostly in the public domain; some portions are provided under<br>BSD-style licenses. See the CREDITS and COPYING files in the<br>distribution for more information.<br>* (time (prog1 t (loop for i from 0 upto 100000000 collect i)))<br>Evaluation took:<br> 1.379 seconds of real time<br> 1.379015 seconds of total run time (0.856185 user, 0.522830 system)<br> [ Real times consist of 1.143 seconds GC time, and 0.236 seconds non-GC time. ]<br> [ Run times consist of 1.146 seconds GC time, and 0.234 seconds non-GC time. ]<br> 100.00% CPU<br> 2,913,031,106 processor cycles<br> 1,600,427,200 bytes consed<br> <br>T<br>* (quit)<br>taoufik@Ankbot:~/workspace/ccl/actor$ ccl<br>Clozure Common Lisp Version 1.12.1 (v1.12.1-22-g6b1f1d3a) LinuxX8664<br><br>For more information about CCL, please see <a href="http://ccl.clozure.com/">http://ccl.clozure.com</a>.<br><br>CCL is free software. It is distributed under the terms of the Apache<br>Licence, Version 2.0.<br>? (time (prog1 t (loop for i from 0 upto 100000000 collect i)))<br>(PROG1 T (LOOP FOR I FROM 0 UPTO 100000000 COLLECT I))<br>took 11,946,514 microseconds (11.946514 seconds) to run.<br> 11,147,722 microseconds (11.147722 seconds, 93.31%) of which was spent in GC.<br>During that period, and with 24 available CPU cores,<br> 11,632,370 microseconds (11.632370 seconds) were spent in user mode<br> 292,428 microseconds ( 0.292428 seconds) were spent in system mode<br> 1,600,000,032 bytes of memory allocated.<br> 397,400 minor page faults, 0 major page faults, 0 swaps.<br>T<br>? <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 5, 2024 at 3:28 PM Taoufik Dachraoui <<a href="mailto:dachraoui.taoufik@gmail.com">dachraoui.taoufik@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">It looks like it is not because of the threads:<div><br></div><div>taoufik@Ankbot:~/workspace/ccl/actor$ sbcl<br>This is SBCL 2.3.11, an implementation of ANSI Common Lisp.<br>More information about SBCL is available at <<a href="http://www.sbcl.org/" target="_blank">http://www.sbcl.org/</a>>.<br><br>SBCL is free software, provided as is, with absolutely no warranty.<br>It is mostly in the public domain; some portions are provided under<br>BSD-style licenses. See the CREDITS and COPYING files in the<br>distribution for more information.<br>* (time (reduce #'+ (loop for i from 0 upto 100000000 collect i)))<br>Evaluation took:<br> 1.836 seconds of real time<br> 1.835223 seconds of total run time (1.351394 user, 0.483829 system)<br> [ Real times consist of 1.184 seconds GC time, and 0.652 seconds non-GC time. ]<br> [ Run times consist of 1.184 seconds GC time, and 0.652 seconds non-GC time. ]<br> 99.95% CPU<br> 3,876,850,246 processor cycles<br> 1,600,427,200 bytes consed<br> <br>5000000050000000<br>* taoufik@Ankbot:~/workspace/ccl/actor$ ccl<br>Clozure Common Lisp Version 1.12.1 (v1.12.1-22-g6b1f1d3a) LinuxX8664<br><br>For more information about CCL, please see <a href="http://ccl.clozure.com/" target="_blank">http://ccl.clozure.com</a>.<br><br>CCL is free software. It is distributed under the terms of the Apache<br>Licence, Version 2.0.<br>? (time (reduce #'+ (loop for i from 0 upto 100000000 collect i)))<br>(REDUCE #'+ (LOOP FOR I FROM 0 UPTO 100000000 COLLECT I))<br>took 13,091,079 microseconds (13.091079 seconds) to run.<br> 11,036,666 microseconds (11.036666 seconds, 84.31%) of which was spent in GC.<br>During that period, and with 24 available CPU cores,<br> 12,734,283 microseconds (12.734283 seconds) were spent in user mode<br> 336,005 microseconds ( 0.336005 seconds) were spent in system mode<br> 1,600,000,032 bytes of memory allocated.<br> 397,400 minor page faults, 0 major page faults, 0 swaps.<br>5000000050000000<br>?<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 5, 2024 at 3:10 PM Taoufik Dachraoui <<a href="mailto:dachraoui.taoufik@gmail.com" target="_blank">dachraoui.taoufik@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi<div><br></div><div>In my current implementation of a classical actor model</div><div>I found that using ccl processes is much slower than sbcl threads</div><div><br></div><div>to create a thread I use ccl:process-run-function, is there another way to </div><div>create native threads that are much faster; I do not need the ccl scheduling,</div><div>I want to create threads that are scheduled by the OS, I think that the ccl </div><div>scheduler is the reason why my ccl tests are much slower than the tests run </div><div>with sbcl</div><div><div><br></div><span class="gmail_signature_prefix"><div><span class="gmail_signature_prefix">Regards</span></div>-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">Taoufik Dachraoui<div><br></div></div></div></div></div>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">Taoufik Dachraoui<div><br></div></div></div>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">Taoufik Dachraoui<div><br></div></div></div>
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