How do Apache Modules work in terms of memory consumption










0















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?










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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















0















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?










share|improve this question






















  • 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













0












0








0








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?










share|improve this question














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






share|improve this question













share|improve this question











share|improve this question




share|improve this question










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

















  • 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












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