How do Apache Modules work in terms of memory consumption
I want to write a big Apache Module in C with many lines of code and many dependencies to external libraries and compile it with APXS.
Lets assume that the code segment of this C program consumes a huge chunk of memory: 100 MB.
What happens concerning the memory, when the module is called 5 times concurrently?
Is the code segment of the C program shared between each invocation, similar to multi-threading, or is the code segment copied in memory?
If the answer is copy:
Since I'm working on a Linux machine, does the "Copy-on-Write" mechanism reliably prevent the actual copy in memory?
At the end: Does the code segment of the 5 concurrent calls consume 100 MB or 500 MB?
c apache memory apache-modules
asked Nov 12 '18 at 17:24
schilleschille
475
add a comment |
I want to write a big Apache Module in C with many lines of code and many dependencies to external libraries and compile it with APXS.
Lets assume that the code segment of this C program consumes a huge chunk of memory: 100 MB.
What happens concerning the memory, when the module is called 5 times concurrently?
Is the code segment of the C program shared between each invocation, similar to multi-threading, or is the code segment copied in memory?
If the answer is copy:
Since I'm working on a Linux machine, does the "Copy-on-Write" mechanism reliably prevent the actual copy in memory?
At the end: Does the code segment of the 5 concurrent calls consume 100 MB or 500 MB?
c apache memory apache-modules
asked Nov 12 '18 at 17:24
schilleschille
475
You need to install Apache on Linux, then poke around modules and create a sample one to start
– Salah-1
Nov 12 '18 at 17:46
Given the size and intensity you mention, I doubt the efficiency of such a module added to http latency ...
– Salah-1
Nov 12 '18 at 17:48
add a comment |
I want to write a big Apache Module in C with many lines of code and many dependencies to external libraries and compile it with APXS.
Lets assume that the code segment of this C program consumes a huge chunk of memory: 100 MB.
What happens concerning the memory, when the module is called 5 times concurrently?
Is the code segment of the C program shared between each invocation, similar to multi-threading, or is the code segment copied in memory?
If the answer is copy:
Since I'm working on a Linux machine, does the "Copy-on-Write" mechanism reliably prevent the actual copy in memory?
At the end: Does the code segment of the 5 concurrent calls consume 100 MB or 500 MB?
c apache memory apache-modules
asked Nov 12 '18 at 17:24
schilleschille
475
I want to write a big Apache Module in C with many lines of code and many dependencies to external libraries and compile it with APXS.
Lets assume that the code segment of this C program consumes a huge chunk of memory: 100 MB.
What happens concerning the memory, when the module is called 5 times concurrently?
Is the code segment of the C program shared between each invocation, similar to multi-threading, or is the code segment copied in memory?
If the answer is copy:
Since I'm working on a Linux machine, does the "Copy-on-Write" mechanism reliably prevent the actual copy in memory?
At the end: Does the code segment of the 5 concurrent calls consume 100 MB or 500 MB?
c apache memory apache-modules
c apache memory apache-modules
asked Nov 12 '18 at 17:24
schilleschille
475
asked Nov 12 '18 at 17:24
schilleschille
475
asked Nov 12 '18 at 17:24
schilleschille
475
asked Nov 12 '18 at 17:24
schilleschille
475
asked Nov 12 '18 at 17:24
schilleschille
475
475
You need to install Apache on Linux, then poke around modules and create a sample one to start
– Salah-1
Nov 12 '18 at 17:46
Given the size and intensity you mention, I doubt the efficiency of such a module added to http latency ...
– Salah-1
Nov 12 '18 at 17:48
add a comment |
You need to install Apache on Linux, then poke around modules and create a sample one to start
– Salah-1
Nov 12 '18 at 17:46
Given the size and intensity you mention, I doubt the efficiency of such a module added to http latency ...
– Salah-1
Nov 12 '18 at 17:48
You need to install Apache on Linux, then poke around modules and create a sample one to start
– Salah-1
Nov 12 '18 at 17:46
You need to install Apache on Linux, then poke around modules and create a sample one to start
– Salah-1
Nov 12 '18 at 17:46
Given the size and intensity you mention, I doubt the efficiency of such a module added to http latency ...
– Salah-1
Nov 12 '18 at 17:48
Given the size and intensity you mention, I doubt the efficiency of such a module added to http latency ...
– Salah-1
Nov 12 '18 at 17:48
add a comment |
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You need to install Apache on Linux, then poke around modules and create a sample one to start
– Salah-1
Nov 12 '18 at 17:46
Given the size and intensity you mention, I doubt the efficiency of such a module added to http latency ...
– Salah-1
Nov 12 '18 at 17:48