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4
votes
1answer
203 views

Shell script: the child process do not terminate in linux

I have written a shell script to initiate three background process in the same time. In shell script I am trying to wait for all children to finish their job and then the parent job to terminate. But, ...
2
votes
1answer
99 views

Python multithreading not working on VPS server

I am running an python multithreaded application with multiple processes which scrapes data from some websites. While running on my localhost It works great, but on the vps server I am using( Centos ...
2
votes
1answer
85 views

Apache could not be stablely support more than 200 visitors at the same time. How to set mpm module?

The server seems not be able to support almost two or three hundred people visiting at the same time. We upload some new codes in Nov. 29the and people saw 404 Not Found frequently ever since that ...
1
vote
1answer
256 views

Adding vCPUs to an existing OS install

The VM configuration dialog in ESXi 5 warns me that if I change the number of vCPUs after the guest OS is installed, the sky will fall - ahem - it 'might make my virtual machine unstable.' I know ...
1
vote
3answers
206 views

Is NFS capable of preserving order of operations?

I have a diskless host 'A', that has a directory NFS mounted on server 'B'. A process on A writes to two files F1 and F2 in that directory, and a process on B monitors these files for changes. Assume ...
1
vote
1answer
87 views

LImiting overall memory usage for child processes

I have a long-running script that launches several child processes on a Linux machine with 8GB of memory. After a few hours of running, it takes up nearly 90% of memory, and this makes other services, ...
1
vote
2answers
154 views

Is Apache 2.2.21 multi processor aware on Windows Server 2003?

I am running a webserver currently on a single CPU on a windows 2003 machine. I'm thinking of adding another processor to increase performance, as some of the web apps on the server are slowing down. ...
0
votes
2answers
136 views

Apache executed only one request and all other requestes wait first to finish

I have a basic install of Apache2 server and PHP5.3 on my local Ubuntu machine. I created file index.php and put sleep 30 seconds in it <?php sleep(30); // script sleep 30s ?> When i run ...
-3
votes
2answers
118 views

Parallel computing: Distributed systems vs multicore processors? [closed]

I was just wondering why there is a need to go through all the trouble of creating distributed systems for massive parallel processing when, we could just create individual machines that support ...