On Friday, 19 October 2018 at 21:29:42 UTC, Per Nordlöw wrote:
Now that
https://github.com/dlang/phobos/pull/6411
has been merged and DMD stable soon has the new
__traits(isZeroInit, T)
found here
https://dlang.org/changelog/2.083.0.html#isZeroInit
are there more zero-initializa
Benchmark code:
dub.sdl
```
name "hashbench"
description "D hashtable comparison."
dependency "emsi_containers" version="~>0.7.0"
dependency "memutils" version="~>0.4.11"
dependency "vibe-d:utils" version="~>0.8.4"
dependency "jive" version="~>0.2.0"
//dependency "collections" version="~>0.1.0"
/
The below benchmarks come from writing 100 int-to-int mappings to
a new hashtable then reading them back, repeated 10_000 times.
The built-in AA doesn't deallocate memory when it falls out of
scope but the other maps do. Benchmark code in next post.
== Speed Ranking using LDC2 (optimized) ==
With LDC2 the times for vibe.utils.hashmap and memutils.hashmap
are suspiciously low, leading me to suspect that the optimizer
might be omitting most of the work. Here are the figures without
optimizations enabled.
== Speed Ranking using DMD (no optimizations) ==
95 msecs built-in AA
168 msec
On Tuesday, 26 June 2018 at 02:20:37 UTC, Manu wrote:
I optimised another major gotcha eating perf, and now this
issue is taking 13% of my entire work time... bummer.
Without disagreeing with you, ldc2 optimizes this fine.
https://run.dlang.io/is/NJct6U
const @property uint onlineapp.Enti
On Tuesday, 26 June 2018 at 03:45:27 UTC, Seb wrote:
Did you by chance also benchmark it with other languages like
C++, Go or Rust?
I didn't since I was evaluating hashtable implementations for use
in a D application.
BTW I'm not sure what your plans are, but are you aware of this
recent ar
BTW the output is formatted so you can get a sorted list of times
across all trials by piping the output through `sort -n`. That's
also why the tests reusing maps start with ( instead of [, so
they will be grouped separately.
On Tuesday, 26 June 2018 at 14:33:25 UTC, Eugene Wissner wrote:
Tanya hashes any value, also integral types; other hashtables
probably not.
Your intuition is correct here. Most of the tables use
`typeid(key).getHash(&key)`, which for `int` just returns `key`.
= Built-in AA =
General case: `t
On Tuesday, 26 June 2018 at 03:45:27 UTC, Seb wrote:
Did you by chance also benchmark it with other languages like
C++, Go or Rust?
= Not reusing hashtables, optimizations enabled =
79 msecs Rust std::collections::HashMap
90 msecs Go built-in map
177 msecs C++ std::unordered_map (whichever impl
On Monday, 9 July 2018 at 19:31:52 UTC, Steven Schveighoffer
wrote:
FYI there have been a lot of recent changes on druntime that
have to do with hashing. It's possible something changed that
affects you.
None of the recent changes ought to affect `ushort[string]` since
it hashes its keys usin
On Monday, 23 October 2017 at 22:22:55 UTC, Adam Wilson wrote:
Additionally, MSFT/C# fully recognizes that the benefits of
Async/Await have never been and never were intended to be for
performance. Async/Await trades raw performance for an ability
to handle a truly massive number of simultaneou
On Monday, 6 November 2017 at 12:25:06 UTC, Biotronic wrote:
I find I often use this in C# with a more complex expression on
the left-hand side, like a function call. A quick search shows
more than 2/3 of my uses are function calls or otherwise
significantly more complex than a variable. Also,
On Wednesday, 29 November 2017 at 14:32:54 UTC, Basile B. wrote:
- There only 4 issues for logger
Considering that one of those issues is that the logger outputs
garbage when given a wstring or a dstring, I would not take this
as an indication that it's time to "graduate" the logger from
exp
On Thursday, 30 November 2017 at 09:37:27 UTC, Robert burner
Schadek wrote:
On Wednesday, 29 November 2017 at 19:48:44 UTC, Nathan S. wrote:
Considering that one of those issues is that the logger
outputs garbage when given a wstring or a dstring, I would not
take this as an indication that it'
https://dlang.org/phobos/std_datetime_systime.html#.Clock.currStdTime
"""
@property @trusted long currStdTime(ClockType clockType =
ClockType.normal)();
Returns the number of hnsecs since midnight, January 1st, 1 A.D.
for the current time.
"""
This choice of offset seems Esperanto-like: delibe
On Saturday, 3 February 2018 at 14:41:06 UTC, Kagamin wrote:
That RCSharedAllocator PR made me think, so this is my take on
how to keep reference counted allocator in shared storage:
https://run.dlang.io/is/r1z1dd
You might also want to look at Atila Neves's automem package. It
uses atomic in
On Tuesday, 6 February 2018 at 06:11:55 UTC, Dmitry Olshansky
wrote:
On Tuesday, 6 February 2018 at 05:45:35 UTC, Steven
Schveighoffer wrote:
On 2/6/18 12:35 AM, Dmitry Olshansky wrote:
That’s really bad idea - isEmail is template so the burden of
freaking slow ctRegex
is paid on per instanti
On Tuesday, 6 February 2018 at 22:29:07 UTC, Walter Bright wrote:
nobody uses regex for lexer in a compiler.
Some years ago I was surprised when I saw this in Clojure's
source code. It appears to still be there today:
https://github.com/clojure/clojure/blob/1215ba346ffea3fe48def6ec70542e3300
On Thursday, 30 November 2017 at 19:01:02 UTC, Andrei
Alexandrescu wrote:
So we may switch to ubyte[]
Hooray!
On Wednesday, 7 February 2018 at 08:21:01 UTC, Seb wrote:
There's `version(StdUnittest)` since a few days
And I've just submitted a pull request that adds
`version(StdUnittest)` to every unittest in the standard library.
https://github.com/dlang/phobos/pull/6159
On Saturday, 17 February 2018 at 12:49:07 UTC, Andrei
Alexandrescu wrote:
On 02/16/2018 10:10 PM, rikki cattermole wrote:
Could use the name for the field as well. At the minimum
useful for debugging purposes.
That would be tricky because fields are decomposed down to
primitive types. -- Andr
On Thursday, 1 March 2018 at 21:01:08 UTC, Steven Schveighoffer
wrote:
Yeah, it seems like -noboundscheck should never be used.
How good is DMD at omitting redundant bounds checks? I assume not
much engineering effort has been put towards that due to
"-boundscheck=off" being available.
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