A bit older reference but worth benchmarking
https://stackoverflow.com/questions/11621606/faster-way-to-move-memory-page-than-mremap
On Tue, Feb 8, 2022 at 6:51 AM r r wrote:
> Hello,
> 1. What is the fastest implementation of resizable array in Java? I know
> only one, that copies whole array
which jvm?
On Sat, Feb 5, 2022 at 6:26 AM r r wrote:
> Hello,
> we know that there are some techniques that make virtual calls not so
> expensive in JVM like Inline Cache or Polymorphic Inline Cache.
>
> Let's consider the following situation:
>
> Base is an interface.
>
> public void f(Base[] b
How well do you already know Linux? Are you comfortable compiling kernels
etc or are you just looking for a stock install? While this seems like a
trivial detail it's not :)
On Thu, Jul 11, 2019, 9:53 PM Ruslan Rusu
wrote:
> Hi here,
>
> I'm a beginner in this space. As I read and learn was cu
"A) Some BIOSes resetting TSC on a single core or hyperthread on each
socket (usually thread 0 of core 0) for some strange reason during the boot
sequence. [I've conclusively shown this on some 4 socket Sandy Bridge
systems.] This leads different vcores to have vastly differing TSC values,
which ge
Given the list and people having many levels of experience/age/etc its
probably worth expounding on : I'm reminded about the old story of the
McIlroy and Knuth word count programs.
https://franklinchen.com/blog/2011/12/08/revisiting-knuth-and-mcilroys-word-count-programs/
On Sat, Jan 19, 2019 at
take a look at http://libcpuid.sourceforge.net/index.html
On Thu, Nov 29, 2018 at 5:19 PM Mani Sarkar wrote:
> Hi,
>
> Haven't written here for a long time. I have a query about probing CPUs
> (via commands and/or programs) to find out vital information about them
> mostly speed/performance rela
So there is a well known protocol for this (determining relative clocks)
from a rather unusual source... chess servers! Many people enjoy playing
chess online very quickly (say 1 minute per side), when playing such quick
games a small latency difference can make a huge overall difference so it
beco
So I would probably focus on some more basic principles with them and focus
on what is faster and *why*. I would also *NOT* use javascript if the point
was to look at efficiency but instead something like C. To be fair you can
teach an aspiring student enough C to write basic data structures very
q
Just to add to the already fair reply by Martin. Take a look at how
eventstore works. It tolerates a minority of servers failing, takes load
similar to stock exchanges, and is OSS so you can actually read the code.
https://github.com/eventstore/eventstore. You can actually find our paxos
implementa
If someone wants to work on it I have a profiler api implementation that
could be a useful starting point. It supports both mono and the CLR (two
separate implementations the mono one is in C the CLR C++)
On Wed, Aug 29, 2018 at 1:07 PM Remi Forax wrote:
>
>
> --
>
>
learning
> purpose.
>
>
> W dniu sobota, 12 maja 2018 21:59:53 UTC+2 użytkownik Greg Young napisał:
>>
>> Will your production system be running over loopback?
>>
>> On Sun, May 13, 2018 at 1:59 AM, John Hening wrote:
>>
>>> I know that testing by loop
Will your production system be running over loopback?
On Sun, May 13, 2018 at 1:59 AM, John Hening wrote:
> I know that testing by loopback isn't the best idea (and that it omits a
> part of the network stack) but it is the simplest and I have just a laptop
> with one physical network interface
We used to have a similar one "mole asses" referring to
https://en.wikipedia.org/wiki/Molasses. Though we also used it in regard to
people on teams.
On Tue, May 8, 2018 at 6:16 PM, Tony Finch wrote:
> Some time ago I encountered the term "peanut butter", meaning bad
> performance due to a pervas
rt going into this is astounding. I can't help thinking
>> that it won't end well.
>>
>> On 04/09/2018 10:55 AM, Greg Young wrote:
>>
>> To be fair many of the fpga based things have also moved to asics. You
>> know you are in for fun when a fpga is too slow.
To be fair many of the fpga based things have also moved to asics. You know
you are in for fun when a fpga is too slow.
On Mon, Apr 9, 2018 at 12:58 AM, Martin Thompson wrote:
> 5+ years ago it was pretty common for folks to modify the Linux kernel or
> run cut down OS implementations when pushi
Will the 16 bytes save you time?
On Fri, Mar 30, 2018 at 10:36 PM, Roman Leventov
wrote:
> Martin, thanks a lot!
>
> I thought about Aeron IPC, but as far as I understand it maps to the queue
> model only when there is a single producer and a single consumer. Also it
> felt a little too heavywei
This is slightly changed in http 2.0 (unsolicited response)
On Thu, Aug 17, 2017 at 6:24 PM, Todd Montgomery wrote:
> REST and RPC have good uses. But they are not a panacea.
>
> REST has implicit coupling because each HTTP request must have a
> corresponding HTTP response. Think of this as mand
I would be interested to test it with zfs, it might even be harmful
On Mon, Jul 10, 2017 at 11:55 PM, Michael Barker wrote:
> From our own experience with journaling the benefits of pre-touching files
> depends on the file system used. When ended up using XFS and threw away
> all of our pre-tou
for a price feed? what good is a 30 second old price update? I would
prefer the current one losing the middle in most cases.
if you were doing level 2 data (order book) this statement would make
more sense.
On Fri, Apr 14, 2017 at 3:00 PM, Vero K. wrote:
> thanks, but losing msgs won't work for
You are likely measuring wrong and just have not figured out how yet.
On Wed, Apr 12, 2017 at 8:56 PM, J Crawford wrote:
> The SO question has the source codes of a simple server and client that
> demonstrate and isolate the problem. Basically I'm timing the latency of a
> ping-pong (client-serve
On another list after getting tons of these we setup the list so it
would require approval on first mail. That got rid of all of them.
On Mon, Jan 30, 2017 at 4:30 PM, Richard Warburton
wrote:
> Hi,
>
> This is not a job postings mailing, please don't send messages like this
> again.
>
> On Mon,
I am not sure how much I would trust an AWS machine in general for benchmarks
On Sun, Jan 29, 2017 at 7:34 PM, Duarte Nunes wrote:
> Forgot to mention that I had to use an AWS machine and CPU counters are not
> available, so not posting those.
>
>
> On Sunday, January 29, 2017 at 8:33:46 PM UTC+1
Why do I have generals and couriers in my head?
On Mon, Jan 2, 2017 at 7:43 AM, k...@kodewerk.com wrote:
>
> On Jan 2, 2017, at 8:31 AM, Chris Vest wrote:
>
> The rabbit hole of what-can-be-trusted goes pretty deep:
> http://sharps.org/wp-content/uploads/BECKER-CHES.pdf
>
>
>
>
> 'Computers have
@Gil this should be a blog post.
On Mon, Dec 26, 2016 at 5:09 PM, Gil Tene wrote:
> One of the biggest reasons folks tend to stay away from the consumer CPUs in
> this space (like the is the i7-6950X you mentioned below) is the ack of ECC
> memory support. I really wish Intel provided ECC suppor
Thought people on here would enjoy this
https://medium.com/@octskyward/modern-garbage-collection-911ef4f8bd8e#.ptdzwcmq2
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no because the 99th percentiles do not necessarily happen at the same time.
On Wed, Dec 21, 2016 at 10:53 AM, Gaurav Abbi wrote:
> Hi,
> We are collecting certain metrics using (Graphite + Grafana) use them as a
> tool to monitor system health and performance.
>
> For one of the latency metric, w
While I don't have an answer to your question I just wanted to point
out that it is a wonderful question and I would love to see more like
this on the list.
On Thu, Dec 15, 2016 at 9:55 AM, Elazar Leibovich wrote:
> Hi,
>
> I wrote a small piece of code that should
> demonstrate the fact that one
In my experience protocol level tcp keep alives don't always work
between implementations. BSD - windows used to be a primary culprit,
though they were set they would not get hit in some cases. Things may
be better today. On same implementation they should work quite well.
Definitely worth testing
https://lkml.org/lkml/2016/10/12/530
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Just guessing but based on the test, the cache aligned version touches
pages with different access pattern than the test without alignment.
On Sun, Sep 11, 2016 at 5:37 PM, Kyle Kavanagh wrote:
> Looking into the effects of false sharing when writing to memory mapped
> files. Intuitively, I woul
http://www.ilikebigbits.com/blog/2014/4/21/the-myth-of-ram-part-i
without comment.
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With exchanges often traffic is sent to everyone when using
non-reliable transports such as UDP. As example see the STAMP protocol
(over UDP multicast). In this protocol every message is given a
sequence number (perfectly ordered). Clients then can find any missing
messages by looking for gaps in t
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