On 19/12/2016 07:58, Marco Atzeri wrote:
On 18/12/2016 15:55, Bahadır Öncel wrote:
Hello all!
I've installed cygwin and openmpi successfully. I can compile and run
mpi programs. Twist is, even the openmpi test program hello_c.c approx
takes a minute to run. When I try in my virtual machine (linux) the
same program takes less than a second to run.
I've found that other users asked the same question but did not find
any solution.
Thanks in advance.
--
the most likely issue is a network interface timeout.
Try disabling WIFI network or VPN interface as test.
Regards
Marco
Hi Bahadır,
this is the normal behaviour of the hello_c run on my machine.
$ time mpirun -n 2 ./hello_c.exe
Hello, world, I am 0 of 2, (Open MPI v1.10.4, package: Open MPI , ident:
1.10.4, repo rev: v1.10.3-45-gaafbd34, Sep 01, 2016, 129)
Hello, world, I am 1 of 2, (Open MPI v1.10.4, package: Open MPI , ident:
1.10.4, repo rev: v1.10.3-45-gaafbd34, Sep 01, 2016, 129)
real 0m3.428s
user 0m1.293s
sys 0m2.930s
The timing should be in the second range.
Attached a program that will allow you to identify all the
network interfaces as seen by Cygwin with their Windows name.
$ gcc -o get-interface get-interface.c
$ ./get-interface
internal_name: {EC2ABB5C-42A8-431D-A133-8F4BE0F309AF}
flags: AF_INET6 up multicast
address: fe80::a479:1393:b7d0:fb25%18
friendly_name: Local Area Connection 2
internal_name: {EC2ABB5C-42A8-431D-A133-8F4BE0F309AF}
flags: AF_INET up broadcast multicast
address: 169.254.251.37
friendly_name: Local Area Connection 2
...and so on.
/* #define _GNU_SOURCE * To get defns of NI_MAXSERV and NI_MAXHOST */
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <net/if.h>
void print_flags(unsigned int flags)
{
const char* sep = "", *sp = " ";
if (flags & IFF_UP) {
printf("%sup", sep);
sep = sp;
}
if (flags & IFF_BROADCAST) {
printf("%sbroadcast", sep);
sep = sp;
}
if (flags & IFF_LOOPBACK) {
printf("%sloopback", sep);
sep = sp;
}
if (flags & IFF_NOTRAILERS) {
printf("%snotrailers", sep);
sep = sp;
}
if (flags & IFF_RUNNING) {
printf("%srunning", sep);
sep = sp;
}
if (flags & IFF_PROMISC) {
printf("%spromisc", sep);
sep = sp;
}
if (flags & IFF_MULTICAST) {
printf("%smulticast", sep);
sep = sp;
}
}
int main(int argc, char *argv[])
{
struct ifaddrs *ifaddr, *ifa;
int family, s, n;
char host[NI_MAXHOST];
struct ifreq ifr;
struct ifreq_frndlyname iff;
struct ifreq_frndlyname * iffp;
struct ifaddrs_hwdata * ifhwdata;
if (getifaddrs(&ifaddr) == -1) {
perror("getifaddrs");
exit(EXIT_FAILURE);
}
/* Walk through linked list, maintaining head pointer so we
can free list later */
for (ifa = ifaddr, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
if (ifa->ifa_addr == NULL)
continue;
family = ifa->ifa_addr->sa_family;
/* Display interface name and family (including symbolic
form of the latter for the common families) */
printf("internal_name: \t%s\n",ifa->ifa_name);
printf(" flags: \t%s ",
(family == AF_INET) ? "AF_INET " :
(family == AF_INET6) ? "AF_INET6" : "unknown ");
print_flags(ifa->ifa_flags);
printf("\n");
/* For an AF_INET* interface address, display the address */
if (family == AF_INET || family == AF_INET6) {
s = getnameinfo(ifa->ifa_addr,
(family == AF_INET) ? sizeof(struct sockaddr_in) :
sizeof(struct sockaddr_in6),
host, NI_MAXHOST,
NULL, 0, NI_NUMERICHOST);
if (s != 0) {
printf("getnameinfo() failed: %s\n", gai_strerror(s));
exit(EXIT_FAILURE);
}
printf(" address:\t%s\n", host);
ifhwdata=ifa->ifa_data;
iffp=&(ifhwdata->ifa_frndlyname);
printf(" friendly_name:\t%s\n\n", iffp->ifrf_friendlyname);
}
}
freeifaddrs(ifaddr);
exit(EXIT_SUCCESS);
}
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