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From: Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>
To: cygwin@cygwin.com
Subject: Re: mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?]
Date: Sat, 4 Sep 2021 17:18:57 -0600	[thread overview]
Message-ID: <ac0a4c5e-da41-1f71-d347-72ee16d4c015@SystematicSw.ab.ca> (raw)
In-Reply-To: <c54c8815-44fe-a837-211e-6497a185c2e8@cornell.edu>

On 2021-09-04 16:37, Ken Brown via Cygwin wrote:
> I've reduced the procps failure to the following test case:
> 
> $ cat mmap_test.c
> #include <unistd.h>
> #include <stdio.h>
> #include <sys/mman.h>
> 
> int
> main ()
> {
>    void *addr;
>    int page_size = getpagesize ();
> 
>    addr = mmap (0, page_size, PROT_READ | PROT_WRITE,
>                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
>    if (addr == MAP_FAILED)
>      perror ("mmap");
> }
> 
> $ gcc mmap_test.c
> 
> $ ./a
> mmap: Invalid argument

Check on Linux and retry on Cygwin without MAP_PRIVATE?
MAP_PRIVATE implies an fd but MAP_ANON does not, and MAP_ANON is in 
Linux(2)/Unix? not POSIX(3p).

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]

  parent reply	other threads:[~2021-09-04 23:18 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 19:49 cygrunsrv + sshd + rsync = 20 times too slow -- throttled? Chris Roehrig
2021-08-24 23:43 ` Mark Geisert
2021-08-25  0:35   ` Chris Roehrig
2021-08-25  2:12     ` Chris Roehrig
2021-08-25  2:02 ` NightStrike
2021-08-25  3:20   ` Mark Geisert
2021-08-25 17:24     ` Chris Roehrig
2021-08-25 11:18 ` Takashi Yano
2021-08-25 17:31   ` Chris Roehrig
2021-08-25 17:52   ` Ken Brown
2021-08-25 18:18     ` Chris Roehrig
2021-08-25 18:51       ` Chris Roehrig
2021-08-26 15:44       ` Ken Brown
2021-08-25 20:33     ` Mario Emmenlauer
2021-08-26 15:47       ` Ken Brown
2021-08-25 21:29     ` Takashi Yano
2021-08-26 15:56       ` Ken Brown
2021-08-26 22:18         ` Ken Brown
2021-08-27 11:24           ` Takashi Yano
2021-08-27 16:00             ` Ken Brown
2021-08-27 17:21               ` Takashi Yano
2021-08-28  2:00                 ` Takashi Yano
2021-08-28  3:03                   ` Takashi Yano
2021-08-28  8:43                 ` Corinna Vinschen
2021-08-28  9:41                   ` Takashi Yano
2021-08-28 11:58                     ` Corinna Vinschen
2021-08-28 15:43                       ` Takashi Yano
2021-08-28 20:55                         ` Ken Brown
2021-08-29  8:41                           ` Takashi Yano
2021-08-29 22:42                             ` Ken Brown
2021-08-29 10:27                         ` Corinna Vinschen
2021-08-29  9:07                     ` Takashi Yano
2021-08-29 15:57                       ` Ken Brown
2021-08-29 19:24                         ` Chris Roehrig
2021-08-29 22:24                           ` Ken Brown
2021-08-30 23:58                             ` Chris Roehrig
2021-08-31 19:05                               ` Ken Brown
2021-08-31 19:53                                 ` Chris Roehrig
2021-08-31 20:23                                   ` Chris Roehrig
2021-08-31 21:29                                     ` Brian Inglis
2021-09-01 21:11                                     ` Chris Roehrig
2021-09-02 15:25                                       ` Ken Brown
2021-09-02 19:03                                         ` Chris Roehrig
2021-09-03 17:26                                           ` Ken Brown
2021-09-03 19:55                                           ` Corinna Vinschen
2021-09-03 20:59                                             ` Chris Roehrig
2021-09-04  8:32                                               ` Achim Gratz
2021-09-04 16:45                                               ` Brian Inglis
2021-09-05  8:18                                                 ` Achim Gratz
2021-09-05 15:11                                                   ` Brian Inglis
2021-09-06 10:42                                                     ` Achim Gratz
2021-09-04 22:37                                             ` mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?] Ken Brown
2021-09-04 22:54                                               ` Ken Brown
2021-09-04 22:58                                                 ` Ken Brown
2021-09-05  0:04                                                   ` Ken Brown
2021-09-05 13:24                                                     ` Ken Brown
2021-09-06 15:32                                                       ` Corinna Vinschen
2021-09-06 17:12                                                         ` Ken Brown
2021-09-06 17:38                                                           ` Ken Brown
2021-09-06 17:43                                                             ` Eliot Moss
2021-09-06 17:59                                                             ` Corinna Vinschen
2021-09-06 18:07                                                               ` Corinna Vinschen
2021-09-06 18:40                                                                 ` Ken Brown
2021-09-06 20:52                                                                   ` Peter Dons Tychsen
2021-09-06 20:54                                                                   ` Peter Dons Tychsen
2021-09-06 21:24                                                                     ` Ken Brown
2021-09-06 21:31                                                                       ` Ken Brown
2021-09-07  3:34                                                                       ` Brian Inglis
2021-09-07 16:28                                                                         ` Ken Brown
2021-09-07 21:52                                                                           ` Lavrentiev, Anton (NIH/NLM/NCBI) [C]
2021-09-07 22:44                                                                             ` Ken Brown
2021-09-08  6:14                                                                               ` Sam Edge
2021-09-08  8:18                                                                         ` Corinna Vinschen
2021-09-07 21:41                                                                       ` Peter Dons Tychsen
2021-09-04 23:18                                               ` Brian Inglis [this message]
2021-08-29 19:37                         ` cygrunsrv + sshd + rsync = 20 times too slow -- throttled? Takashi Yano
2021-08-29 21:09                           ` Ken Brown
2021-08-29 21:04                       ` Ken Brown
2021-08-30  0:13                         ` Takashi Yano
2021-08-30  0:22                           ` Takashi Yano
2021-08-30  2:15                             ` Ken Brown
2021-08-30  8:02                               ` Takashi Yano
2021-08-28 15:17                   ` Ken Brown
2021-09-16 22:00 ` Keith Christian
2021-09-16 22:48   ` Ken Brown
2021-09-16 22:58     ` Keith Christian

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