Rseq | Restartable Sequences : a userspace implementation | GPU library
kandi X-RAY | Rseq Summary
kandi X-RAY | Rseq Summary
Rseq is a userspace take on the proposed kernel restartable sequences API, and provides and mechanism to perform efficient per-cpu operations. This isn't intended to be a long-running project. Instead, its goal is to allow userland experiments with rseq (without having to recompile the kernel), to collect data as to how useful it would be.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Rseq
Rseq Key Features
Rseq Examples and Code Snippets
Community Discussions
Trending Discussions on Rseq
QUESTION
In Haskell, I have a list that can be evaluated in parallel. Each individual evaluation doesn't take that long, but there are many of them (1 million, for example). I'm using the following library. The plan is split the list into chunks and run them in parallel. I have something like the following that works:
...ANSWER
Answered 2021-Apr-02 at 20:39Unfortunately, I believe GHC currently does not expose any functionality for observing (in IO
, obviously) the evaluation progress of parallel computations. You will need to use concurrency in the form of forkIO
and friends (or a library that wraps them like the async
package) instead.
QUESTION
I created a polynomial function that returns the string based representation of the terms of polynomial added together, however i was having difficulties in removing terms from the string that contain the 0 coefficient and its giving me a different output
Below is my function:
...ANSWER
Answered 2020-Nov-15 at 21:13i would propose gathering all the polynom print parts altogether into a flat collection, and then print all of them to string. Could look like this:
QUESTION
In arch/x86/entry/syscalls/syscall_64.tbl
syscalls are numbered from 0 to 334 and then there is a gap before the syscall numbers resume at 424. The relevant portion of the source is shown below:
ANSWER
Answered 2020-Sep-02 at 20:40The purpose seems to be to sync up syscall numbers across architectures (source).
Viewing the git blame
for the commented line in that file, one can find this commit message:
arch: add split IPC system calls where neededThe IPC system call handling is highly inconsistent across architectures, some use sys_ipc, some use separate calls, and some use both. We also have some architectures that require passing IPC_64 in the flags, and others that set it implicitly.
For the addition of a y2038 safe semtimedop() system call, I chose to only support the separate entry points, but that requires first supporting the regular ones with their own syscall numbers.
The IPC_64 is now implied by the new semctl/shmctl/msgctl system calls even on the architectures that require passing it with the ipc() multiplexer.
I'm not adding the new semtimedop() or semop() on 32-bit architectures, those will get implemented using the new semtimedop_time64() version that gets added along with the other time64 calls. Three 64-bit architectures (powerpc, s390 and sparc) get semtimedop().
QUESTION
Since the result returns more than 1 row, it is not able to INSERT INTO
the @TEMP_ROW
table. I want all the rows to be inserted into the @TEMP_ROW
table. Can I use a while loop? If yes, how? Or any other method?
ANSWER
Answered 2019-Nov-07 at 04:25Try insert
from select
syntax.
QUESTION
I'm a college student studying OS.
I'm trying to add my own system call in Linux kernel, and something is going wrong.
My environment is stated below:
- Linux Kernel v.4.19.1
- 64-bit Ubuntu LTS 18.04.1 with Intel Core i5-4210M CPU on Oracle VirtualBox 5.2.18
- 64-bit Windows 10 Home 1803 as a host machine
Since I'm working on x86_64 machine, I started with arch/x86/entry/syscalls/syscall_64.tbl.
In Linux kernel v.4.19.1, the last entry is
ANSWER
Answered 2018-Dec-12 at 05:39You need to tell the build system that your system call requires 2 arguments and that they are of type int
. This is so that the scripts that are part of the build system will generate appropriate wrappers for casting the arguments into the type you require. Instead of defining the actual handler like you did, you should use -
QUESTION
how to send a message PRACK?
I give so:
...ANSWER
Answered 2019-Oct-22 at 21:00PRACK's aren't supported in the SIPSorcery SIP implementation (they're not part of the main specification and aren't very common).
The approach would be to use the uac.ServerInviteTransaction
to generate the PRACK request based on the GetInTransactionACKRequest
.
A better place for this question would be on github and if you still have the need I can add it relatively quickly.
QUESTION
I need help in forwarding a predicate parameter in Akka messages. I create the predicate when I call a case class in Master
. I need to forward this parameter to Worker
node. Here is a part of my implementation.
ANSWER
Answered 2018-Nov-06 at 05:13Solved the problem by creating a type Predicate [T] = {String, T => Boolean}
.
Then modified the code as:
QUESTION
I'm currently working through the book 'Parallel and Concurrent Programming in Haskell', and I'm trying to get one of the first examples to run on my machine, it is effectively some sudoku solver algorithm that the book shows how to use haskell to divide solving multiple iterations of the solver across two cores. Here is the code:
...ANSWER
Answered 2018-Jul-16 at 05:24Maybe try running:
QUESTION
I've run some tests:
...ANSWER
Answered 2017-Dec-25 at 16:09By default, GHC runs all programs using a single OS thread, even with -threaded
enabled. Note the text "using -N1" in your output - it indicates that the program is being run with 1 physical thread.
In short: pass e.g. +RTS -N8
to your program. For documentation of this flag, see here.
In a broad sense, this is due to the distinction between parallelism and concurrency. Here are some SO questions which try to explain the difference. The difference can be summarized as:
parrallelism: a task subdivided into similar chunks to run simultaneously on separate cores/CPUs at some point in time; for increased speed
concurrency: several tasks being executed conceptually independently such that their execution times overlap, whether on the same thread through time slicing or on separate cores/CPUs; usually utilizing shared resources more efficiently
However, these definitions are somewhat contentious; sometimes the two have opposite meanings, and sometimes they are used interchangeably. However, for the purpose of understanding this problem (why you must pass another flag in addition to -threaded
to make a 'parallel' program actually run in parallel) I believe they are useful definitions.
QUESTION
When I run this program with -s
:
ANSWER
Answered 2017-Oct-06 at 21:33I can reproduce your behaviour (ghc-8.2.1, parallel-3.2.1.1).
Later on down the Strategies.hs
is a RULES
pragma that special-cases parList rseq
. I guess it is a bug that it has different behaviour to parTraversable
(I don't know enough about the internals to be sure where the bug lies). I'd suggest filing a ticket at the parallel
issue tracker: https://github.com/haskell/parallel/issues
Here is the code in question, starting at line 505 of the file:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install Rseq
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page