On Thursday, 11 April 2024 at 00:24:44 UTC, Andy Valencia wrote:
I wrote a "count newlines" based on mapped files. It used about twice the CPU of the version which just read 1 meg at a time. I thought something was amiss (needless slice indirection or something), so I wrote the code in C. It had the same CPU usage as the D version. So...mapped files, not so much. Not D's fault. And writing it in C made me realize how much easier it is to code in D!
For a repeatable comparison, you should provide the code which does 1MB reads.
I have found that mmapped files are faster than reading buffered files, but maybe only for large files?
-Steve
