php - parallel process with popen -


i need download files many web servers , somethigs. files big. each downloads it's independent want in parallel.

so write following scripts:

test.php

$urls = [     'url1', 'url2', 'url3' ];  foreach($urls $url){     popen("php download.php --url=" . $url, "w"); }

download.php

$options = getopt(null, ["url:"]); $url = $options["url"]; // somethings - loop testing purposes for($i = 0; $i <= 1000000000; $i++){     $i; } print parse_url($url)["host"];

when run php test.php console show me sequencial output. doing wrong?

if want them run in async use this, run each in background.

popen("php download.php --url=" . $url . " &", "w");

demo:

<?php $urls = ['www.baidu.com', 'github.com', 'stackoverflow.com']; foreach($urls $url) {   var_dump(popen("ping -c4 " . $url . " &", "w"));   echo "dddd\n"; }

output:

ei@localhost:~$ php test.php resource(4) of type (stream) dddd resource(5) of type (stream) dddd resource(6) of type (stream) dddd ei@localhost:~$ ping www.a.shifen.com (61.135.169.121) 56(84) bytes of data. ping github.com (192.30.255.112) 56(84) bytes of data. ping stackoverflow.com (151.101.193.69) 56(84) bytes of data. 64 bytes 61.135.169.121: icmp_seq=1 ttl=56 time=5.53 ms 64 bytes 151.101.193.69: icmp_seq=1 ttl=53 time=75.1 ms 64 bytes 192.30.255.112: icmp_seq=1 ttl=47 time=262 ms 64 bytes 61.135.169.121: icmp_seq=2 ttl=56 time=5.24 ms 64 bytes 151.101.193.69: icmp_seq=2 ttl=53 time=74.7 ms 64 bytes 192.30.255.112: icmp_seq=2 ttl=47 time=262 ms 64 bytes 61.135.169.121: icmp_seq=3 ttl=56 time=30.4 ms 64 bytes 151.101.193.69: icmp_seq=3 ttl=53 time=107 ms 64 bytes 192.30.255.112: icmp_seq=3 ttl=47 time=260 ms 64 bytes 61.135.169.121: icmp_seq=4 ttl=56 time=20.0 ms  --- www.a.shifen.com ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 5.244/15.311/30.413/10.578 ms 64 bytes 151.101.193.69: icmp_seq=4 ttl=53 time=95.3 ms  --- stackoverflow.com ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3005ms rtt min/avg/max/mdev = 74.732/88.154/107.341/13.857 ms 64 bytes 192.30.255.112: icmp_seq=4 ttl=47 time=256 ms  --- github.com ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 256.064/260.310/262.474/2.606 ms

Comments

Post a Comment

Popular posts from this blog

inversion of control - Autofac named registration constructor injection -

does autofac support specifying registration name in components' constructors? example: ninject's namedattribute . you need use autofac.extras.attributed package on top achieve this so let's have 1 interface , 2 classes: public interface ihello { string sayhello(); } public class englishhello : ihello { public string sayhello() { return "hello"; } } public class frenchhello : ihello { public string sayhello() { return "bonjour"; } } then have consumer class, in want select instance injected: public class helloconsumer { private readonly ihello helloservice; public helloconsumer([withkey("en")] ihello helloservice) { if (helloservice == null) { throw new argumentnullexception("helloservice"); } this.helloservice = helloservice; } public string sayhello() { return this.helloservice.sayhello()...
Read more

verilog - Systemverilog dynamic casting issues -

i've code snippet following in testbench function void write_to_port( my_data_type_base data ); my_data_type_extended data_ext; if(!$cast(data_ext, data)); `uvm_error(get_type_name(), "failed cast"); `uvm_info(get_name(), $psprintf("data_ext :\n%s", data_ext.sprint()), uvm_medium) // write data_ext out port.... endfunction when run it, i'm getting uvm_error "failed cast." i'm not quire sure why $cast not returning 1. can see, i'm printing out extended class data item after casting uvm_info. can see it's being cast properly. if don't use $cast if condition, don't runtime error. isn't coding practice use if dynamic cast check if $cast returning 1 ? what might reason behind cast not returning 1 in above case? i think semicolon on line 'if' not belong? i think consumes if statement, , uvm_error executes regardless of how if evaluates: if(!$cast(data_ext, data)); <- no semico...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more