Re: [Scilab-users] output buffer
Le 20/06/2022 à 12:04, Jean-Yves Baudais a écrit :
Hello,
Le 17/06/2022 à 23:45, Stephane Mottelet a écrit :
The buffer size is not set by Scilab and hence is always the default
for a given platform (it can be different for macOS, Linux, Windows).
I suppose you need to increase or decrease it for a given application?
It is just for convenience. Here a better explanation. During
simulation, I write some variables on file (used latter for
statistical analysis) and I use to prepare and test the
post-processing using the partial output data. Scilab does not write
the data one by one, but by block of size 4096. The following code
shows this behaviour.
--> function stupidWrite(fd,n,a)
--> for i=1:n mfprintf(fd,"%d",a); end
--> endfunction
--> fd=mopen("test.am","a");
--> stupidWrite(fd,4096,1);
--> unix_g("cat test.am | wc ");
ans =
" 0 0 0"
--> stupidWrite(fd,1,2);
--> unix_g("cat test.am | wc ");
ans =
" 0 1 4096"
--> mclose(fd)
--> unix_g("cat test.am |wc ")
ans =
" 0 1 4097"
With the C language, the size of the output buffer is managed using
setvbuf. It seems that there is no interface for C-coded version of
setvbuf (contrary to many input/output C function).
So my question is: "is it possible to manage the size of the output
buffer in Scilab?"
The solution I found is to mopen and mclose the file each time I want
to write something. Is there another solution?
To me, here the issue looks not so much about the size of the internal
buffer, but about the inability to flush buffered data on request,
whatever is the buffer size.
For instance, we could simply hope that, for a text file, sending an
ascii(12) form feed alone (*) would trigger flushing the buffer, in a
trivial, documented, and straightforward way.
By the way, the current default buffering and buffer size of mfprintf()
would deserve being documented.
My two cents
Samuel
(*) easy to detect by the receiver: 1 byte, equal to ascii(12) => flush
instead of writing.
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Re: [Scilab-users] output buffer
Hello,
Le 17/06/2022 à 23:45, Stephane Mottelet a écrit :
The buffer size is not set by Scilab and hence is always the default for
a given platform (it can be different for macOS, Linux, Windows). I
suppose you need to increase or decrease it for a given application?
It is just for convenience. Here a better explanation. During
simulation, I write some variables on file (used latter for statistical
analysis) and I use to prepare and test the post-processing using the
partial output data. Scilab does not write the data one by one, but by
block of size 4096. The following code shows this behaviour.
--> function stupidWrite(fd,n,a)
--> for i=1:n mfprintf(fd,"%d",a); end
--> endfunction
--> fd=mopen("test.am","a");
--> stupidWrite(fd,4096,1);
--> unix_g("cat test.am | wc ");
ans =
" 0 0 0"
--> stupidWrite(fd,1,2);
--> unix_g("cat test.am | wc ");
ans =
" 0 14096"
--> mclose(fd)
--> unix_g("cat test.am |wc ")
ans =
" 0 14097"
With the C language, the size of the output buffer is managed using
setvbuf. It seems that there is no interface for C-coded version of
setvbuf (contrary to many input/output C function).
So my question is: "is it possible to manage the size of the output
buffer in Scilab?"
The solution I found is to mopen and mclose the file each time I want to
write something. Is there another solution?
Thanks,
--Jean-Yves
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Re: [Scilab-users] output buffer
Hello Jean-Yves, I tried to reproduce the problem but without success. Could you give us an example ? With mine, I generate a file with 8192 lines of 26624 characters. a = "a":"z"; for i = 1:10, a = a + a;end length(a) //26624 form = "%s\n"; for i = 1:13, form = form+form;end length(form) /4 //8192 times "%s\n" args = list(); args(8192) = a; //alloc list for i = 1:8191, args(i) = a;end fd = mopen(fullfile(TMPDIR, "mfprintf.txt"), "wt"); try tic(); mfprintf(fd, form, args(:)); toc() catch end mclose(fd); Regards, Antoine Le 2022-06-17 14:41, Jean-Yves Baudais a écrit : Hello, In other words, how to use "setvbuf" in Scilab? Is there an equivalent function that works with the mfprintf scilab function? Thanks, --Jean-Yves Le 16/06/2022 à 10:39, Jean-Yves Baudais a écrit : How to manage *the size*. Sorry. Jean-Yves Le 16/06/2022 à 10:38, Jean-Yves Baudais a écrit : Hello, How can we manage the output buffer when we write to a file? It seems that this buffer size is 4096. Thanks, Jean-Yves ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] output buffer
Hello, The buffer size is not set by Scilab and hence is always the default for a given platform (it can be different for macOS, Linux, Windows). I suppose you need to increase or decrease it for a given application ? S. --- Stephane Mottelet Le 2022-06-17 14:41, Jean-Yves Baudais a écrit : Hello, In other words, how to use "setvbuf" in Scilab? Is there an equivalent function that works with the mfprintf scilab function? Thanks, --Jean-Yves Le 16/06/2022 à 10:39, Jean-Yves Baudais a écrit : How to manage *the size*. Sorry. Jean-Yves Le 16/06/2022 à 10:38, Jean-Yves Baudais a écrit : Hello, How can we manage the output buffer when we write to a file? It seems that this buffer size is 4096. Thanks, Jean-Yves ___ users mailing list users@lists.scilab.org https://antispam.utc.fr/proxy/v3?i=SXVFem5DOGVpUU1rNjdmQuxbAYzjRE578NJDXO0bRW0=bWt1djZ5QzcyUms5R1Nzas4Pz4hn3S9_MEd_XcyeYzHsyKCVRtQ67N89rCt3q6Xy=Q3ZQNmU2SnpsRFlRbUF3dm35RmWaJxuoBVu42ymMGAK3JGu3n6Y8Xa7RPvcRg_db=http%3A//lists.scilab.org/mailman/listinfo/users=syJL ___ users mailing list users@lists.scilab.org https://antispam.utc.fr/proxy/v3?i=SXVFem5DOGVpUU1rNjdmQuxbAYzjRE578NJDXO0bRW0=bWt1djZ5QzcyUms5R1Nzas4Pz4hn3S9_MEd_XcyeYzHsyKCVRtQ67N89rCt3q6Xy=Q3ZQNmU2SnpsRFlRbUF3dm35RmWaJxuoBVu42ymMGAK3JGu3n6Y8Xa7RPvcRg_db=http%3A//lists.scilab.org/mailman/listinfo/users=syJL ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] output buffer
Hello, In other words, how to use "setvbuf" in Scilab? Is there an equivalent function that works with the mfprintf scilab function? Thanks, --Jean-Yves Le 16/06/2022 à 10:39, Jean-Yves Baudais a écrit : How to manage *the size*. Sorry. Jean-Yves Le 16/06/2022 à 10:38, Jean-Yves Baudais a écrit : Hello, How can we manage the output buffer when we write to a file? It seems that this buffer size is 4096. Thanks, Jean-Yves ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] output buffer
How to manage *the size*. Sorry. Jean-Yves Le 16/06/2022 à 10:38, Jean-Yves Baudais a écrit : Hello, How can we manage the output buffer when we write to a file? It seems that this buffer size is 4096. Thanks, Jean-Yves ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
