How can i create exactly one number of processes ?
For example i want to create l*n processes and i tried this:
But it creates more than l*n
Also, i want each child to run another x.c program with 3 command line arguments(row,column and segment_id) using execvp() , but i can't do it.
In the x.c i have to multiply 2 arrays(A[l][m],B[m][n] different dimensions) and save the result to C[l][n] array.
I have the A and B arrays in the main program and i created a C array in shared memory like this:
I am running HP-UX B.11.11.
I'm increasing a parameter for a database engine so that it uses more memory to buffer the disk drive (to speed up performance). I have over 5GB of memory not being used.
But when I try to start the DB with the increased buffer parameter I get told.
"Not... (1 Reply)
hi,
this is the problem: i want to swap a linked list between 4 processes (unrelated), is there any way i can do that just by sending a pointer to a structure?
//example
typedef struct node
{
int x;
char c;
struct node *next;
} node;
or i should send the items ( x,c ) by... (9 Replies)
I need to create a shared library to access an in memory DB. The DB is not huge, but big enough to make it cumbersome to carry around in every single process using the shared library. Luckily, it is pretty static information, so I don't need to worry much about synchronizing the data between... (12 Replies)
I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability.
Obviously, I'll have to worry about mutual exclusion. (0 Replies)
Hello ,
I would like to know how to check if a given process id belongs to particualr shared memory segment .
Please help
Thanks in advance (3 Replies)
Is there some way to tell what processes are attached to a shared memory segment? We have a system on which I perform "icps -ma" and there are several segments pending deletion having numerous processes attached to them and I can't tell what processes they are. Neither the creator's pid nor last... (7 Replies)
QUESTION: How do I run processes in parallel, so that the counter (in counter.txt) would vary in value (instead of just "0" and "1")? That is, how to not sequentially run inc.sh and dec.sh?
The shared counter (a single number starting as 0) is in a file counter.txt.
counter.sh is (supposed to... (2 Replies)
Hi again!
I have 2 questions ..:
How can i create exactly one number of processes ?
For example i want to create l*n processes and i tried this:
for(i=0;i<l*n;i++){
pid=fork()}
But it creates more than l*n
Also, i want each child to run another x.c program with 3 command line... (1 Reply)
Hello.
I am new to this forum and I would like to ask for advice about low level POSIX programming.
I have to implement a POSIX compliant C shared library.
A file will have some variables and the shared library will have some functions which need those variables.
There is one special... (5 Replies)
Discussion started by: iamjag
5 Replies
LEARN ABOUT MOJAVE
footprint
FOOTPRINT(1) BSD General Commands Manual FOOTPRINT(1)NAME
footprint -- gathers memory information about one or more processes
SYNOPSIS
footprint [-j path] [-f bytes|formatted|pages] [-p name|pid] [-x name|pid] [-t] [-s] [-v] [-y] [-w] [--swapped] [--wired] [-a] process-name |
pid | memgraph [...]
footprint -h, --help
DESCRIPTION
The footprint utility gathers and displays memory consumption information for the specified processes or memory graph files.
footprint will display all addressable memory used by the specified processes, but it emphasizes memory considered 'dirty' by the kernel for
purposes of accounting. If multiple processes are specified, footprint will de-duplicate multiply mapped objects and will display shared
objects separately from private ones.
footprint must be run as root when inspecting processes that are not owned by the current user.
OPTIONS -a, --all
target all processes (will take much longer)
-j, --json path
also save a JSON representation of the data to the specified path
-f, --format bytes|formatted|pages
textual output should be formatted in bytes, pages, or human-readable formatted (default)
-p, --proc name
target the given process by name (can be used multiple times)
-p, --pid pid
target the given process by pid (can be used multiple times)
-x, --exclude name/pid
exclude the given process by name or pid (can be used multiple times)
often used with --all to exclude some processes from analysis
-t, --targetChildren
in addition to the supplied processes, target their children, grandchildren, etc.
-s, --skip
skip processes that are dirty tracked and have no outstanding XPC transactions (i.e., are "clean")
-v display vmmap-like output of address space layout
-y, --summary
print only regions with dirty memory, and condense __TEXT, __DATA, and __LINKEDIT regions into 'Other' subtotal
-w, --wide
show wide output with all columns (implies --swapped --wired)
--swapped
show swapped/compressed column, a subset of 'dirty'
--wired
show wired memory column, a subset of 'dirty'
-h, --help
display help and exit
SAMPLE USAGE
footprint Mail WindowServer
OS X January 29, 2018 OS X