I've been doing some reading lately about threading (Posix threads) and I'm really curious about a couple things that I've read. I'm not sure if many people here have threading experience, but I thought it would be nice to be able to discuss some questions about it.
(For the record, I did... (1 Reply)
Hi,
I have written a code which will run a set of process using
fork.
I want to know from You how can i start another job when one of my job in my loop is completed
My code is
#include<stdio.h>
#include<ctype.h>
main() {
int pid,cid;
ChildProcess();
... (1 Reply)
Hi All,
Here's my question
I have a 385 MB file containing 5,000,000 records.
I need to read from the file and load into a table.
Initially i thought of doing it in a single thread (execution of a single program) but when calculated accounted 16 hours of time on a standard benchmark.
Hence... (5 Replies)
Sir,
Can I call same function in the start routines of different Threads.
I have created two different threads....and wanna call same function from both threads....is it possible???
Also can I fork inside a thread??? (1 Reply)
Hi, If we create 10 threads to invoke runQuery method at same time, Will queryProcessor will be overriden sometime or 10 different copies will be created?
We are not using any sunchronzation mechnism in runQuery(). so there is not gurantee on QueryProcessor class variables right OR each 10... (1 Reply)
In this piece i implemented the gossip method. The first thread is invoked from inside the (msg is first sent from node -1 to 0 from main()) and the other threads are invoked from inside of the thread function itself. I used two mutexes and a condition variable to control the synchronization. ... (4 Replies)
Hi, I am trying to get my head round Multi Threading and I have a few queries to try and clear up my confusion
Q1. Is multi threading a hardware / chip level concept, an OS level or an application level concept ? I am trying to work out where SMT architecture fits in.
Q2. What's the multi... (3 Replies)
Not just background process running ... but im looking if unix has any multi-threading concept like in Java, C# ... if not present, can you pls share the nearest feature in unix that is close to multi-threaded concept (3 Replies)
Hi,
Can we apply multi threading in Unix. I am using bash shell.
We have a generic script to load the data to table based on file input. For each file there is an individual table to load.
For each file found in directory I want to load the data in parallel to target table using
... (3 Replies)
Discussion started by: vedanta
3 Replies
LEARN ABOUT OSX
hwprefs
HWPREFS(1) BSD General Commands Manual HWPREFS(1)NAME
hwprefs -- inspect and control low-level system and processor parameters
SYNOPSIS
hwprefs [-v] [-h] [cpu_count={1..N}] [cpu_enable {1..N}] [cpu_disable {1..N}] [cpu_l2_cache={true, false}] [cpu_l3_cache={true, false}]
[cpu_nap={true, false}] [cpu_hwprefetch={0, 4, 8}] [cpu_nop_dsts={true, false}] [memctl_readbypass={true, false}] [os_class]
[os_type] [machine_type] [memory_size] [cpu_type] [cpu_freq] [cpu_bus_freq] [memctl_type] [ioctl_type"]
DESCRIPTION
hwprefs inspects and controls low-level system and processor parameters
-v verbose mode
-h display help message
cpu_count={1..N}
number of processors available for use by MacOS X
cpu_enable {1..N}
enable a specific processor
cpu_disable {1..N}
disable a specific processor
cpu_nap={true, false}
processor nap
cpu_l2_cache={true, false}
processor L2 cache
cpu_l3_cache={true, false}
processor L3 cache
cpu_hwprefetch={0, 4, 8}
prefetch engines used by hardware prefetcher (PPC970 only):
0 - all prefetch engines disabled, DST instructions treated as NOPs
4 - four automatic hardware prefetch engines, four used by DST instructions
8 - eight automatic hardware prefetch engines, DST instructions treated as NOPs
cpu_nop_dsts={true, false}
treat DST instructions as nops
memctl_readbypass={true, false}
memory controller (U3 only) read-bypass optimization (allows read commands to memory to bypass straight to read memory request
queue, saving a significant number of cycles)
os_class
displays OS class {Cheetah, Puma, Jaguar, Smeagol, Panther, Tiger}
os_type displays operating system type
machine_type
displays machine type
memory_size
displays system memory
cpu_type
displays processor type and version
cpu_freq
displays processor clock frequency
cpu_bus_freq
displays processor bus frequency
memctl_type
displays memory controller type
ioctl_type
displays io controller type
Darwin December 21, 2005 Darwin