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Re: bugs to fix before 4.4.0 release

From: John W. Eaton
Subject: Re: bugs to fix before 4.4.0 release
Date: Thu, 4 Jan 2018 10:07:58 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 01/03/2018 07:09 PM, Michael D Godfrey wrote:
Just for information, I get a very similar ratio for dev/4.2.1. This
is a bigger jump than in the past. My system is an Intel NUC7i5BNH,
i.e. I7 CPU.

I tried a few modifications, but the ratio stayed about the same.
Also, CPU usage (on 1 processor) was at just about 100% for the whole time in all

Is it not possible to get a trace on justĀ  the a = a + b + 123.0 sequence?

I haven't done any real profiling, but from my tests it looks like the evaluation of the expression is the real problem. Comparing

  t0=tic; for i=1:1000; for j=1:1000; end; end; t1=toc(t0); t1

in 4.2.1 and the current dev version I see nearly identical results. Both were built with GCC 7.2.0 on a Debian system.


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