I was trying to understand why math might be so slow in Erlang, and if so, what I could do to find out where it is slow and try to speed it up. Some people said it's because it's a VM, but I doubt that because the JVM is fast at math, and so is V8. Other people said it's because it's an immutable language, but OCaml is immutable and quite fast at math. So what makes Erlang slow at math, and how would I go about finding where in the code it is slow? I can only imagine using DTrace, as I don't know Linux/BSD tools that well that I should use as well, and I don't know which ones would be good at profiling code within a VM and the VM itself, and if those require different tools.
1
There are 1 answers
Related Questions in ERLANG
- Azure VM: Single disk (filesystem) greater than 1023 GB?
- Backup strategy for build tool hosted on Azure VM
- New-AzureQuickVM not creating VM on exsisting Cloud Service?
- Ping Azure VM in same subnet using VM name
- 'Your credentials did not work' in MS Azure
- Installing Azure powershell in an azure Virtual Machine
- Azure Virtual Network Custom DNS Server
- Extend On-premise AD to Azure
- How can I use Azure-provided DNS for Resource Manager VMs?
- Find out data traffic coming in and going out through azure VM
Related Questions in BEAM
- Azure VM: Single disk (filesystem) greater than 1023 GB?
- Backup strategy for build tool hosted on Azure VM
- New-AzureQuickVM not creating VM on exsisting Cloud Service?
- Ping Azure VM in same subnet using VM name
- 'Your credentials did not work' in MS Azure
- Installing Azure powershell in an azure Virtual Machine
- Azure Virtual Network Custom DNS Server
- Extend On-premise AD to Azure
- How can I use Azure-provided DNS for Resource Manager VMs?
- Find out data traffic coming in and going out through azure VM
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
Popular Tags
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Before OTP24:
BEAM does not have JIT, so typically the erlang compiler (
erlc) outputs bytecode: Any math operation needs to access the VM registers (which are memory positions), perform the actual operation, place the result in the relevant VM register and then jump to the next instruction. This is quite slow compared to just performing the actual operation in machine code.If you use any language that compiles directly to machine code (like C), the compiler has a lot more information about the code and the platform and thus is able to use features that speed up execution of the operations like optimizing the processor's pipeline, using vectorized instructions, placing the most accessed variables in processor's registers, optimizing memory access so that they hit the cache...
The HiPE compiler is there to compile erlang code to native, and you should use it if your program uses a lot of math. Be sure to check its limitations, though.
If the HiPE compiler is not enough, you can always code the critical math operations in C and include it.
Furthermore, you should check this question with a comparison between Erlang and C (and others) for a pure math problem
Regarding immutability, it shouldn't have any impact unless your integers are placed on the thread's heap (>60bits) because those are the only ones that require explicit memory handling.
In order to profile Erlang code, you have these tools to deal with Erlang from within.
Lastly, you can always post your snippet here and maybe we'll be able to point something.
After OTP24:
Erlang now has JIT, some reports state as much as 25% improvement.