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Re: hgsave weirdness


From: Dmitri A. Sergatskov
Subject: Re: hgsave weirdness
Date: Mon, 23 Sep 2019 13:14:53 -0500



On Mon, Sep 23, 2019 at 12:45 PM Dmitri A. Sergatskov <address@hidden> wrote:


On Mon, Sep 23, 2019 at 12:31 PM Rik <address@hidden> wrote:
On 09/23/2019 09:00 AM, address@hidden wrote:
Subject:
hgsave weirdness
From:
"Dmitri A. Sergatskov" <address@hidden>
Date:
09/22/2019 09:27 PM
To:
Octave Help <address@hidden>, octave-maintainers <address@hidden>
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<mailto:address@hidden>
Precedence:
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MIME-Version:
1.0
Message-ID:
<address@hidden>
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Message:
2

$ cat t2.m
h1=figure();
plot(randn(10));
fname = "t2.ofig"
hgsave(h1, fname)
h2=hgload(fname)
h1_l = get(h1);
h2_l = get(h2);
assert(h1, h2)


$ ls -l t2.ofig
ls: cannot access 't2.ofig': No such file or directory

octave:1> t2
fname = t2.ofig
error: hgload: unable to locate file t2.ofig
error: called from
    hgload at line 60 column 7
    t2 at line 5 column 3
octave:2> t2
fname = t2.ofig
h2 =  3
error: ASSERT errors for:  assert (h1,h2)

  Location  |  Observed  |  Expected  |  Reason
     ()           2            3         Abs err 1 exceeds tol 0 by 1
octave:3>

Adding pause(10) after hgsave() does not seem to change anything, so
it is not a timing issue.

What is going on here?

I'm not seeing the first problem with hgload.  Here is my session



So I added pause(10) after hgsave and also changed hgsave to text format.
During those 10 seconds delay i run less t2.ofig and see that the file is there.

I also ran strace on this but all I see is:

<...>
read(5, "\4\0\0\0\0\0\0\0", 16)         = 8
recvmsg(11, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(11, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=5, events=POLLIN}, {fd=11, events=POLLIN}, {fd=12, events=POLLIN}, {fd=14, events=POLLIN}], 4, 8145) = 0 (Timeout)
recvmsg(11, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(11, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=5, events=POLLIN}, {fd=11, events=POLLIN}, {fd=12, events=POLLIN}, {fd=14, events=POLLIN}], 4, 19864error: hgload: unable to locate file t2.ofig
error: called from
    hgload at line 60 column 7
    t2 at line 6 column 3
) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\1\0\0\0\0\0\0\0", 16)         = 8
<...>
This is repeatable 100% on 2 different computers with Fedora 31. I will try clang compile next.

Dmitri.
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