fork/exec performance problem?

2016-06-14 Thread Johan Holmberg via Digitalmars-d
Hi! I'm trying to write a simple D program to emulate "parallel -u -jN", ie. running a number of commands in parallel to take advantage of a multicore machine (I'm testing on a 24-core Ubuntu machine). I have written almost equivalent programs in C++ and D, and hoped that they should run equally

Re: Read text file fast, how?

2015-07-29 Thread Johan Holmberg via Digitalmars-d
On Wed, Jul 29, 2015 at 11:47 AM, Jacob Carlborg via Digitalmars-d < digitalmars-d@puremagic.com> wrote: > On 2015-07-27 14:03, Johan Holmberg via Digitalmars-d wrote: > >> The timings running my program normally (not using Instruments now), >> became as follows with the d

Re: Read text file fast, how?

2015-07-27 Thread Johan Holmberg via Digitalmars-d
On Mon, Jul 27, 2015 at 11:03 AM, via Digitalmars-d < digitalmars-d@puremagic.com> wrote: > Are you including program startup and exit in the timing? For comparison, > can you include the timings of an empty do-nothing program in all the > languages? > Yes, I measure the whole program. But these

Re: Read text file fast, how?

2015-07-27 Thread Johan Holmberg via Digitalmars-d
On Sun, Jul 26, 2015 at 5:36 PM, Andrei Alexandrescu via Digitalmars-d < digitalmars-d@puremagic.com> wrote: > On 7/26/15 10:35 AM, Johan Holmberg via Digitalmars-d wrote: > >> >> On Sat, Jul 25, 2015 at 10:12 PM, Andrei Alexandrescu via Digitalmars-d >> mailto:digit

Re: Read text file fast, how?

2015-07-26 Thread Johan Holmberg via Digitalmars-d
On Sat, Jul 25, 2015 at 10:12 PM, Andrei Alexandrescu via Digitalmars-d < digitalmars-d@puremagic.com> wrote: > On 7/25/15 1:53 PM, Johan Holmberg via Digitalmars-d wrote: > >> Thanks, my question seems like a carbon copy of the Stack Overflow >> article :) Somehow I had

Re: Read text file fast, how?

2015-07-25 Thread Johan Holmberg via Digitalmars-d
On Sat, Jul 25, 2015 at 7:14 PM, Andrei Alexandrescu via Digitalmars-d < digitalmars-d@puremagic.com> wrote: > On 7/25/15 8:19 AM, Johan Holmberg via Digitalmars-d wrote: > >> Hi! >> >> I am trying to port a program I have written earlier to D. My previous >> v

Read text file fast, how?

2015-07-25 Thread Johan Holmberg via Digitalmars-d
Hi! I am trying to port a program I have written earlier to D. My previous versions are in C++ and Python. I was hoping that a D version would be similar in speed to the C++ version, rather than similar to the Python version. But currently it isn't. Part of the problem may be that I haven't learn