Re: bugs to fix before 4.4.0 release

[John W. Eaton]

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
> cases.
>
> Is it not possible to get a trace on just  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.

jwe