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kandi X-RAY | mem Summary
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QUESTION
I would like to divide a single owned array into two owned halves—two separate arrays, not slices of the original array. The respective sizes are compile time constants. Is there a way to do that without copying/cloning the elements?
...ANSWER
Answered 2022-Jan-04 at 21:40use std::convert::TryInto;
let raw = [0u8; 1024 * 1024];
let a = u128::from_be_bytes(raw[..16].try_into().unwrap()); // Take the first 16 bytes
let b = u64::from_le_bytes(raw[16..24].try_into().unwrap()); // Take the next 8 bytes
QUESTION
I just downloaded activiti-app from github.com/Activiti/Activiti/releases/download/activiti-6.0.0/…
and deployed in tomcat9, but I have this errors when init the app:
ANSWER
Answered 2021-Dec-16 at 09:41Your title says you are using Java 9. With Activiti 6 you will have to use JDK 1.8 (Java 8).
QUESTION
Gist: Trying to write a custom filter on nested documents using painless. Want to write error checks when there are no nested documents to surpass null_pointer_exception
I have a mapping as such (simplified and obfuscated)
...ANSWER
Answered 2021-Dec-07 at 10:49Elastic
flatten objects. Such that
QUESTION
Whenever I try to run
...ANSWER
Answered 2021-Nov-16 at 11:46Well, this is interesting. I did not think of searching for lsof
's COMMAND
column, before.
Turns out, ControlCe
means "Control Center" and beginning with Monterey, macOS does listen ports 5000
& 7000
on default.
- Go to System Preferences > Sharing
- Uncheck
AirPlay Receiver
. - Now, you should be able to restart
puma
as usual.
QUESTION
I would like to build up a tree consisting of polymorphic objects of type Node
which are
allocated with a custom PMR allocator.
So far, everything functions well, but I cannot figure out how to properly delete polymorphic objects allocated with a non-standard allocator?? I have only come up with a solution to declare
a static object holding a reference to a std::pmr::memory_resource
.. but that's nasty.
Is there any "right" way to delete custom-allocated polymorphic objects ?
Here is a self-containing example:
...ANSWER
Answered 2021-Nov-04 at 14:23Prior to C++20, there was no way to invoke a deallocation function (operator delete
) that didn't call your class' destructor first, making it impossible for you to clean up extra explicitly allocated resources owned by your class (without hacky code like your static pointer)
If you have access to C++20, then I encourage you to use destroying delete which was created to solve problems like this.
- Your class can hold onto an instance of
std::pmr::memory_resource*
(injected through the constructor) - Change your
operator delete
into e.g.,void operator delete(Node *ptr, std::destroying_delete_t) noexcept
destroying_delete
is a tag that, when you use it, indicates that you will take responsibility for invoking the appropriate destructor.
- Derived classes should also implement a similar deleter.
Without making too many changes to your code, we can do the following in Node
:
QUESTION
I am using ANTLR 4.9.2 to parse a grammar that represents assembly instructions.
...ANSWER
Answered 2021-Oct-27 at 06:23Your question boils down to: "how can I convert my parse tree to an abstract syntax tree?". The simple answer to that is: "you can't" :). At least, not using a built-in ANTLR mechanism. You'll have to traverse the parse tree (using ANTLR's visitor- or listener mechanism) and construct your AST manually.
The feature to more easily create AST's from a parse tree often pops up both in ANTLR's Github repo:
as well as on stackoverflow:
QUESTION
In short:
I have implemented a simple (multi-key) hash table with buckets (containing several elements) that exactly fit a cacheline. Inserting into a cacheline bucket is very simple, and the critical part of the main loop.
I have implemented three versions that produce the same outcome and should behave the same.
The mystery
However, I'm seeing wild performance differences by a surprisingly large factor 3, despite all versions having the exact same cacheline access pattern and resulting in identical hash table data.
The best implementation insert_ok
suffers around a factor 3 slow down compared to insert_bad
& insert_alt
on my CPU (i7-7700HQ).
One variant insert_bad is a simple modification of insert_ok
that adds an extra unnecessary linear search within the cacheline to find the position to write to (which it already knows) and does not suffer this x3 slow down.
The exact same executable shows insert_ok
a factor 1.6 faster compared to insert_bad
& insert_alt
on other CPUs (AMD 5950X (Zen 3), Intel i7-11800H (Tiger Lake)).
ANSWER
Answered 2021-Oct-25 at 22:53The TLDR is that loads which miss all levels of the TLB (and so require a page walk) and which are separated by address unknown stores can't execute in parallel, i.e., the loads are serialized and the memory level parallelism (MLP) factor is capped at 1. Effectively, the stores fence the loads, much as lfence
would.
The slow version of your insert function results in this scenario, while the other two don't (the store address is known). For large region sizes the memory access pattern dominates, and the performance is almost directly related to the MLP: the fast versions can overlap load misses and get an MLP of about 3, resulting in a 3x speedup (and the narrower reproduction case we discuss below can show more than a 10x difference on Skylake).
The underlying reason seems to be that the Skylake processor tries to maintain page-table coherence, which is not required by the specification but can work around bugs in software.
The DetailsFor those who are interested, we'll dig into the details of what's going on.
I could reproduce the problem immediately on my Skylake i7-6700HQ machine, and by stripping out extraneous parts we can reduce the original hash insert benchmark to this simple loop, which exhibits the same issue:
QUESTION
I want to iterate over the bytes of an integer:
...ANSWER
Answered 2021-Sep-28 at 09:44The Rust documentation mentions this behavior for array
:
Prior to Rust 1.53, arrays did not implement IntoIterator by value, so the method call
array.into_iter()
auto-referenced into a slice iterator. Right now, the old behavior is preserved in the 2015 and 2018 editions of Rust for compatibility, ignoringIntoIterator
by value. In the future, the behavior on the 2015 and 2018 edition might be made consistent to the behavior of later editions.
You will get references if you're using Rust 2018
, but for the time being you can use IntoIterator::into_iter(array)
Dereferencing the b
within the loop will hint at this:
QUESTION
I am trying to run a tensorflow project and I am encountering memory problems on the university HPC cluster. I have to run a prediction job for hundreds of inputs, with differing lengths. We have GPU nodes with different amounts of vmem, so I am trying to set up the scripts in a way that will not crash in any combination of GPU node - input length.
After searching the net for solutions, I played around with TF_FORCE_UNIFIED_MEMORY, XLA_PYTHON_CLIENT_MEM_FRACTION, XLA_PYTHON_CLIENT_PREALLOCATE, and TF_FORCE_GPU_ALLOW_GROWTH, and also with tensorflow's set_memory_growth
. As I understood, with unified memory, I should be able to use more memory than a GPU has in itself.
This was my final solution (only relevant parts)
...ANSWER
Answered 2021-Aug-29 at 18:26Probably this answer will be useful for you. This nvidia_smi python module have some useful tools like checking the gpu total memory. Here I reproduce the code of the answer I mentioned earlier.
QUESTION
I have a Spring Boot Application (Version 2.5.3) with enabled SSL using a self signed certificate. One endpoint is used to download a file in the client using a StreamingResponseBody.
ProblemThe Problem is, when a user requests a file via this endpoint, the connection pool doesn't get cleaned up. Working example showcasing the problem here: https://github.com/smotastic/blocked-connection-pool
...ANSWER
Answered 2021-Aug-16 at 09:35try adding
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