The time trace format that ldc outputs comes from Google.

It is used by Chrome's dev tools; Chrome has a built in visualizer for the format (now deprecated): chrome://tracing

Perfetto should be preferred instead: https://ui.perfetto.dev/

File format documentation (out of date): https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview

You need to use a visualizer to make sense of the data. Such as the bundled with ldc tool timetrace2txt.

On Monday, 10 April 2023 at 13:43:09 UTC, Richard (Rikki) Andrew Cattermole wrote:
> The time trace format that ldc outputs comes from Google.
>
> It is used by Chrome's dev tools; Chrome has a built in visualizer for the format (now deprecated): chrome://tracing
>
> Perfetto should be preferred instead: https://ui.perfetto.dev/
>
> File format documentation (out of date): https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview
>
> You need to use a visualizer to make sense of the data. Such as the bundled with ldc tool timetrace2txt.

thanks for explain.  ui.perfetto.dev work well.

On Monday, 10 April 2023 at 13:43:09 UTC, Richard (Rikki) Andrew Cattermole wrote:
> The time trace format that ldc outputs comes from Google.
>
> It is used by Chrome's dev tools; Chrome has a built in visualizer for the format (now deprecated): chrome://tracing
>
> Perfetto should be preferred instead: https://ui.perfetto.dev/
>
> File format documentation (out of date): https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview
>
> You need to use a visualizer to make sense of the data. Such as the bundled with ldc tool timetrace2txt.

I build with -O0 and -c to check the build time cost. (avoid link and too much Optimize)

I find the write file(s) process take 60% time for most case.  the output object file size is not big(like 1.4M), but take 650ms.

is there some time coat action for Write file(s) ?

On Monday, 10 April 2023 at 14:20:26 UTC, d007 wrote:
> On Monday, 10 April 2023 at 13:43:09 UTC, Richard (Rikki) Andrew Cattermole wrote:
>> [...]
>
> I build with -O0 and -c to check the build time cost. (avoid link and too much Optimize)
>
> I find the write file(s) process take 60% time for most case.  the output object file size is not big(like 1.4M), but take 650ms.
>
> is there some time coat action for Write file(s) ?

for a large projects , write file(s) process cost more than 75%.  and ldc2 get more slower for recent version.