I leave the code here, maybe someone needs the same thing!
Code:
#define R 10000
#define P 10000
int main()
{ int **mat;
int j;
mat = (int **)malloc(R*sizeof(int*));
for(j=0;j<R;j++)
mat[j]=(int*)malloc(P*sizeof(int));
}
1 . Thanks everyone who read the post first.
2 . I have a log file which size is 143M , I can not use vi open it .I can not use xedit open it too.
How to view it ?
If I want to view 200-300 ,how can I implement it
3 . Thanks (3 Replies)
Hello,
I would like to conditionaly comment in my code source some fields from arrays. So I use the property ## from the #define definition.
my code:
...
#define slet /##*
#define etsl *##/
...
const T_SVT_ADLL_A653_DESC A_DESC =
{
{ slet qwerty etsl SLICING,... (3 Replies)
if i do this in C
#define NUM 1234512345
then how come i cant print it out using
int main(int argc, char **argv) {
printf("%d\n", NUM);
return 0;
}
well the result is -1219236538, why isnt it 1234512345 ? (7 Replies)
Hi all,
Is there a way to convert full data matrix to linearised left data matrix?
e.g full data matrix
Bh1 Bh2 Bh3 Bh4 Bh5 Bh6 Bh7
Bh1 0 0.241058 0.236129 0.244397 0.237479 0.240767 0.245245
Bh2 0.241058 0 0.240594 0.241931 0.241975 ... (8 Replies)
Hi everyone
I am very new at awk but think that that might be the best strategy for this. I have a matrix very similar to a correlation matrix and in practical terms I need to convert it into a list containing the values from the matrix (one value per line) with the first field of the line (row... (5 Replies)
Hi all,
I have a complex (beyond my biological expertise) problem at hand.
I need to merge multiple files into 1 big matrix. Please help me with some code.
Inp1
Ang_0 chr1 98 T A
Ang_0 chr1 352 G A
Ang_0 chr1 425 C T
Ang_0 chr2 ... (1 Reply)
Discussion started by: newbie83
1 Replies
LEARN ABOUT PHP
malloc_info
MALLOC_INFO(3) Linux Programmer's Manual MALLOC_INFO(3)NAME
malloc_info - export malloc state to a stream
SYNOPSIS
#include <malloc.h>
int malloc_info(int options, FILE *stream);
DESCRIPTION
The malloc_info() function exports an XML string that describes the current state of the memory-allocation implementation in the caller.
The string is printed on the file stream stream. The exported string includes information about all arenas (see malloc(3)).
As currently implemented, options must be zero.
RETURN VALUE
On success, malloc_info() returns 0; on error, it returns -1, with errno set to indicate the cause.
ERRORS
EINVAL options was nonzero.
VERSIONS
malloc_info() was added to glibc in version 2.10.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+--------------+---------------+---------+
|Interface | Attribute | Value |
+--------------+---------------+---------+
|malloc_info() | Thread safety | MT-Safe |
+--------------+---------------+---------+
CONFORMING TO
This function is a GNU extension.
NOTES
The memory-allocation information is provided as an XML string (rather than a C structure) because the information may change over time
(according to changes in the underlying implementation). The output XML string includes a version field.
The open_memstream(3) function can be used to send the output of malloc_info() directly into a buffer in memory, rather than to a file.
The malloc_info() function is designed to address deficiencies in malloc_stats(3) and mallinfo(3).
EXAMPLE
The program below takes up to four command-line arguments, of which the first three are mandatory. The first argument specifies the number
of threads that the program should create. All of the threads, including the main thread, allocate the number of blocks of memory speci-
fied by the second argument. The third argument controls the size of the blocks to be allocated. The main thread creates blocks of this
size, the second thread created by the program allocates blocks of twice this size, the third thread allocates blocks of three times this
size, and so on.
The program calls malloc_info() twice to display the memory-allocation state. The first call takes place before any threads are created or
memory allocated. The second call is performed after all threads have allocated memory.
In the following example, the command-line arguments specify the creation of one additional thread, and both the main thread and the addi-
tional thread allocate 10000 blocks of memory. After the blocks of memory have been allocated, malloc_info() shows the state of two allo-
cation arenas.
$ getconf GNU_LIBC_VERSION
glibc 2.13
$ ./a.out 1 10000 100
============ Before allocating blocks ============
<malloc version="1">
<heap nr="0">
<sizes>
</sizes>
<total type="fast" count="0" size="0"/>
<total type="rest" count="0" size="0"/>
<system type="current" size="135168"/>
<system type="max" size="135168"/>
<aspace type="total" size="135168"/>
<aspace type="mprotect" size="135168"/>
</heap>
<total type="fast" count="0" size="0"/>
<total type="rest" count="0" size="0"/>
<system type="current" size="135168"/>
<system type="max" size="135168"/>
<aspace type="total" size="135168"/>
<aspace type="mprotect" size="135168"/>
</malloc>
============ After allocating blocks ============
<malloc version="1">
<heap nr="0">
<sizes>
</sizes>
<total type="fast" count="0" size="0"/>
<total type="rest" count="0" size="0"/>
<system type="current" size="1081344"/>
<system type="max" size="1081344"/>
<aspace type="total" size="1081344"/>
<aspace type="mprotect" size="1081344"/>
</heap>
<heap nr="1">
<sizes>
</sizes>
<total type="fast" count="0" size="0"/>
<total type="rest" count="0" size="0"/>
<system type="current" size="1032192"/>
<system type="max" size="1032192"/>
<aspace type="total" size="1032192"/>
<aspace type="mprotect" size="1032192"/>
</heap>
<total type="fast" count="0" size="0"/>
<total type="rest" count="0" size="0"/>
<system type="current" size="2113536"/>
<system type="max" size="2113536"/>
<aspace type="total" size="2113536"/>
<aspace type="mprotect" size="2113536"/>
</malloc>
Program source
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <malloc.h>
#include <errno.h>
static size_t blockSize;
static int numThreads, numBlocks;
#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE);
} while(0)
static void *
thread_func(void *arg)
{
int j;
int tn = (int) arg;
/* The multiplier '(2 + tn)' ensures that each thread (including
the main thread) allocates a different amount of memory */
for (j = 0; j < numBlocks; j++)
if (malloc(blockSize * (2 + tn)) == NULL)
errExit("malloc-thread");
sleep(100); /* Sleep until main thread terminates */
return NULL;
}
int
main(int argc, char *argv[])
{
int j, tn, sleepTime;
pthread_t *thr;
if (argc < 4) {
fprintf(stderr,
"%s num-threads num-blocks block-size [sleep-time]
",
argv[0]);
exit(EXIT_FAILURE);
}
numThreads = atoi(argv[1]);
numBlocks = atoi(argv[2]);
blockSize = atoi(argv[3]);
sleepTime = (argc > 4) ? atoi(argv[4]) : 0;
thr = calloc(numThreads, sizeof(pthread_t));
if (thr == NULL)
errExit("calloc");
printf("============ Before allocating blocks ============
");
malloc_info(0, stdout);
/* Create threads that allocate different amounts of memory */
for (tn = 0; tn < numThreads; tn++) {
errno = pthread_create(&thr[tn], NULL, thread_func,
(void *) tn);
if (errno != 0)
errExit("pthread_create");
/* If we add a sleep interval after the start-up of each
thread, the threads likely won't contend for malloc
mutexes, and therefore additional arenas won't be
allocated (see malloc(3)). */
if (sleepTime > 0)
sleep(sleepTime);
}
/* The main thread also allocates some memory */
for (j = 0; j < numBlocks; j++)
if (malloc(blockSize) == NULL)
errExit("malloc");
sleep(2); /* Give all threads a chance to
complete allocations */
printf("
============ After allocating blocks ============
");
malloc_info(0, stdout);
exit(EXIT_SUCCESS);
}
SEE ALSO mallinfo(3), malloc(3), malloc_stats(3), mallopt(3), open_memstream(3)COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 MALLOC_INFO(3)
10-02-2009
