Thank you for your response.
Your answer is difficult and I don't understand well.
I am making a program to calculate pi, and when I calculate a huge number of
digits pi, the calculation is finished and all the variables are released, but
a lot of memory remains in use.
I set a release flag for each variable and checked it programmatically to see
if there was any omission of variable release, but there was no omission of
variable release.In fact, the memory was low and execution was almost stopped
at the end of the program. This is a symptom of a memory leak.
Shows test_mul.c execution status.tsuka@tsuka:~/sqrt$ g++ -Wall test_mul.c -o
test_mul01 -lgmp
tsuka@tsuka:~/sqrt$ ./test_mul01
start: num= 200,000,000
clear end any key in so end <--At this time vmstat memory free value is
62606.It is the same value even if
I wait for 1 minute.
0 <-- At this time vmstat memory free value is 62639,62639-62606=33MiB is
memory leak
tsuka@tsuka:~/sqrt$
Test_mul.c is shown below again,but since gmp allocates alarge memory,the
memory leak seems to be caused by gmp.
Best regards.Susumu Tsukamoto
/* test_mul.c g++ -Wall test_mul.c -o test_mul01 -lgmp*/#include "gmp.h"
#include <locale.h>int main()
{
long int num = 200000000; // 200,000,000
long int ik;
char dm[5];
setlocale(LC_ALL,"ja_JP.utf-8"); mpz_t DC;
printf(" start: num= %'ld \n", num);
mpz_init_set_str(DC, "10000000000000000000",10); // DC=10^19
ik = 19; // DC=10^ik set num/2 <= ik < num
while (ik * 2 < num) {
mpz_mul(DC, DC, DC);
ik = ik * 2;
} mpz_clear(DC);
printf(" clear end any key in so end \n");
scanf("%s", dm);
}
Susumu tsukamoto
----- Original Message -----
From: Torbjörn Granlund <[email protected]>
To: [email protected]
Cc: "[email protected]" <[email protected]>
Date: 2021/2/25, Thu 20:22
Subject: Re: memory leak huge number of digits mpz_mul, mpf_sqrt_ui
Your analysis is very likely incorrect.
You may cause the same "leak" without GMP. Just malloc a set of large
chunks of different sizes. Access them to make sure it is actually
there, then free them in some random order. Often the free calls will
not have given back the memory to the system. Still, that's no memory
leak in the sense you seem to suggest.
--
Torbjörn
Please encrypt, key id 0xC8601622
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