[GAP Forum] Repeating workspace save/load

[Keshav Rao Kini]

Hello all,

I'd like to apologize for the hyperlinks that I seem to have sent within the terminal output in my previous mail. If you are reading your mail in a terminal or some reader which attempts to convert HTML mail to plaintext, there may be garbage inside the script - I have uploaded the correct script to the following URL: http://pastebin.ca/1953162 .

Please note that on OS X you may need to replace "seq" with "jot" as the operating system doesn't come with GNU coreutils (thanks to Dr. Dmitrii Pasechnik for pointing this out to me).

Yours,
    Keshav

On Fri, Oct 1, 2010 at 19:17, Keshav Rao Kini <krkini at ntu.edu.sg<mailto:krkini at ntu.edu.sg>> wrote:
Hello,

I am not maintainer of GAP, but I thought I would try to confirm your report. Unfortunately, I cannot seem to duplicate this error. I wrote a small test script, and with it I managed to save and load a workspace 257 times without GAP segfaulting. See below for output:

keshav at banana ~ $ cat test.sh
#!/bin/bash
echo "x0 := 0;; SaveWorkspace(\"0.ws<http://0.ws>\");; quit;" | gap -q
for i in `seq $(($1-1))`
do
        echo "x$i := $i;; SaveWorkspace(\"$i.ws<http://i.ws>\");; quit;" | gap -q -L $((i-1)).ws
        rm $((i-1)).ws
done
ls -l $(($1-1)).ws

keshav at banana ~ $ time ./test.sh 257
-rw-r--r-- 1 keshav keshav 25705844 Oct  1 19:01 256.ws<http://256.ws>

real    2m12.342s
user    1m9.868s
sys     0m33.966s
keshav at banana ~ $ uname -a
Linux banana 2.6.32-5-amd64 #1 SMP Fri Sep 17 21:50:19 UTC 2010 x86_64 GNU/Linux

Maybe the error is caused by something specific to your two environments? Feel free to try out my script for yourself as well, though I suspect your own result will not change (unless it was caused by running out of disk space, or something). Perhaps someone from the GAP Support Group can speculate further...

Yours,
    Keshav



On Fri, Oct 1, 2010 at 16:43, Shunsuke Tsuchioka <tshun at kurims.kyoto-u.ac.jp<mailto:tshun at kurims.kyoto-u.ac.jp>> wrote:
Hi,

I want to ask about a possibility of
repeating workspace save and load.
It seems impossible more than 5 times as shown below.
The error occurs on Linux in  x86(64bit) machine,
but exactly the same error occurrs in my solaris environment
(GAP4, Version: 4.4.9 of 6-Nov-2006, sparc-sun-solaris2.10-gcc, sparc 32bit).
Is the behavior by design or a bug?

Sincerely,
Shunsuke Tsuchioka

cherry05:~/GAP/nG2> /home/tshun/math/gap -b
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
gap> a:=1;
1
gap> SaveWorkspace("a");
true
gap> quit;
cherry05:~/GAP/nG2> /home/tshun/math/gap -b -L a
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
gap> b:=2;
2
gap> SaveWorkspace("b");
true
gap> quit;
cherry05:~/GAP/nG2> /home/tshun/math/gap -b -L b
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
gap> c:=3;
3
gap> SaveWorkspace("c");
true
gap> quit;
cherry05:~/GAP/nG2> /home/tshun/math/gap -b -L c
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
gap> d:=1;
1
gap>  SaveWorkspace("d");
true
gap> quit;
cherry05:~/GAP/nG2> /home/tshun/math/gap -b -L d
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
gap> e:=1;
1
gap> SaveWorkspace("e");
true
gap> quit;
cherry05:~/GAP/nG2> /home/tshun/math/gap -b -L e
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
gap> f:=1;
1
gap> SaveWorkspace("f");
true
gap> quit;
cherry05:~/GAP/nG2> /home/tshun/math/gap -b -L f
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
gap> g:=1;
1
gap>  SaveWorkspace("g");
true
gap> quit;
cherry05:~/GAP/nG2> /home/tshun/math/gap -b -L g
Segmentation fault

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