I know that by convention Go string contain UTF-8 encoded text.
Is it recommended/a good practice to store invalid bytes in a string ?
The use case:
- compute a hash => get a []byte
- convert the []byte to string (this string is not UTF-8 valid)
- use the string as a map key
In my case, the hash
Hi Robert,
Thanks for your explanation. But how could I "logged the number of
operations done per Go routine", which particular debug settings you
referring to?
It is reasonable that sync.Mutex rely on runtime scheduler but channels do
not. However, it is unclear why a significant performance d
On Tue, Aug 20, 2019 at 10:12 AM Pierre Durand wrote:
>
> I know that by convention Go string contain UTF-8 encoded text.
To my understanding this is not entirely true -- see
https://blog.golang.org/strings#TOC_2. -- It is simply a readonly slice of
bytes. However there is at least 2 places wher
On Tue, 20 Aug 2019, at 9:33 AM, changkun wrote:
> Hi Robert,
>
> Thanks for your explanation. But how could I "logged the number of operations
> done per Go routine", which particular debug settings you referring to?
> It is reasonable that sync.Mutex rely on runtime scheduler but channels do
Hi Ian Davis, I read the issue before I post this thread.
I think the old issue is quite different than here. Here the problem
discusses sudden performance drop and unexpected regression,
but the issue#5183 only did experiment on a very limited number of
goroutines, and Dmitry's answer is fair
OK, thank you !
Le mardi 20 août 2019 10:34:55 UTC+2, djeg...@gmail.com a écrit :
>
> On Tue, Aug 20, 2019 at 10:12 AM Pierre Durand wrote:
> >
> > I know that by convention Go string contain UTF-8 encoded text.
>
> To my understanding this is not entirely true -- see
> https://blog.golang.org/st
I personally wouldn't do this. If you're going to incur the overhead of a heap
allocation, might as well incur a bit more and encode the hash, eg. using
hex.EncodeToString [1], just so that you don't forget and try to print or
decode the string as utf8 later.
—Sam
[1]: https://godoc.org/encodi
Printf can print hexadecimal just fine. Never understood the point of
encoding/hex.
Meanwhile, for questions about strings, see blog.golang.org/strings.
-rob
On Tue, Aug 20, 2019 at 9:00 PM Sam Whited wrote:
> I personally wouldn't do this. If you're going to incur the overhead of a
> heap al
On August 20, 2019 11:50:54 AM UTC, Rob Pike wrote:
>Printf can print hexadecimal just fine. Never understood the point of
>encoding/hex.
I always thought that the C style format strings were unreadable and the hex
package methods were much clearer, personally.
—Sam
--
You received this me
Hi Than,
I'm trying to implement the abi part for arm64, and got two questions for
you:
1, function CABIOracle::canPassDirectly in
gollvm/bridge/go-llvm-cabi-oracle.cpp, I'm not quite understand the first
if statement:
if (regsInt + regsSSE == 1)
return true;
Why not consider whether th
Well, in my case I don't want to convert the []byte to hexadecimal string,
because it uses 2x more memory.
The code contains a huge map where the key is an MD5 hash.
Please note that I'm not personally working on this.
I was reviewing the code written by a coworker, and I noticed that there
was
If you just print the final value of V in both cases you will see: On my iMac:
channels: 215606060
mutex: 651606060
Or the mutex has 3x greater throughput. How the Go routines are scheduled is OS
dependent - the OSX code uses the same mechanism in both cases.
You have to remember that that the
Hi,
I have a Go module which looks as follows:
go.mod
go.sum
|
- pkg1
|
-pkg2
The module is called mydomain.com/mypkg
I'm trying to run the tests for pkg1 by calling
go test ./pkg1/...
My problem is that pkg1 imports mydomain.com/mypkg/pkg2 and that running
the tests
On Tue, Aug 20, 2019 at 3:17 PM Pierre Durand wrote:
>
> Well, in my case I don't want to convert the []byte to hexadecimal string,
> because it uses 2x more memory.
> The code contains a huge map where the key is an MD5 hash.
md5 hash is an array type and can be used as a map key directly:
http
Hi Eric,
Thanks for the note. Your question about the code in
CABIOracle::canPassDirectly, e.g .
if (regsInt + regsSSE == 1)
return true;
is a good one. I'll see about adding some comments to the code there.
By way of explanation, the Gollvm code is modeled after the approach used
in cla
Forgot to add:
When I was writing the x86_64 ABI code for gollvm, I spent some time
creating an ABI test harness to find problems in my code. You can find it
at:
https://github.com/thanm/cabi-testgen
The overall idea is that it randomly generates a lot of parameter-passing
code, then you can bui
Sent https://go-review.googlesource.com/c/gollvm/+/190900 to improve
comments.
Thanks, Than
On Tue, Aug 20, 2019 at 9:33 AM Than McIntosh wrote:
> Hi Eric,
>
> Thanks for the note. Your question about the code in
> CABIOracle::canPassDirectly, e.g .
>
> if (regsInt + regsSSE == 1)
> retur
I am assuming that there is an internal Go structure/process that when there is less than N Go routines it fits in the L1 CPU cache, and beyond a certain point it spills to the L2 or higher - thus the nearly order of magnitude performance decrease, yet consistent times within a range.Since the work
I am of the opinion that a case like this is best handled by simply writing
the thing you want.
Concurrency limits are easily managed by using tokens to gate fetches. One
simple technique is to make a channel of struct{} with capacity equal to
the maximum number of concurrent connections you are a
Hello Chris,
I made a small project with the same structure as yours to reproduce the
problem : https://github.com/supcik/rtppwgm
But in my project, everything works as expected :
» go test -count=1 ./...
ok demo/pkg1 0.006s
ok demo/pkg2 0.006s
» go test -count=1 ./pkg1/.
It could fail if you're under $GOPATH and GO111MODULE=auto, since inside
the GOPATH, auto=off
-- Marcin
On Tue, Aug 20, 2019 at 12:43 PM Jacques Supcik wrote:
> Hello Chris,
>
> I made a small project with the same structure as yours to reproduce the
> problem : https://github.com/supcik/rtppw
On Mon, Aug 12, 2019 at 8:21 PM Xiangdong JI wrote:
>
> The .go files generated during building gccgo seem to have a few constants
> with weird values, for example:
>
> // sysinfo.go (on x86-64, latest gcc-9 trunk)
>
> const ___FLT128_MAX__ = 1.1
> const ___FLT32X_DENORM_MIN__ = 1.1
>
> as a comp
https://golang.org/pkg/net/
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ht
Using Dave Cheney's profile package to figure out the execution path of a
library I'm trying to understand.
The application starts, (it's a server), I hit ^c after a couple of
minutes, and the console says
Stopping Profiling
Stopping
Main() catches the console interrupt:
signal.Not
On Mon, Aug 19, 2019 at 6:44 PM joe mcguckin
wrote:
>
> I was perusing the NET library web page today.
>
> 1) Are the packages listed in any particular order?
The types and functions are listed alphabetically.
> 2) What is the hierarchy? e.g., which functions correspond to the low level
> Unix
https://golang.org/doc/asm
$ cat x.go
package main
func main() {
println(3)
}
$ GOOS=linux GOARCH=amd64 go tool compile -S x.go# or: go build
-gcflags -S x.go
--- prog list "main" ---
(x.go:3) TEXTmain+0(SB),$8-0
0001 (x.go:3) FUNCDATA $0,gcargs·0+0(SB)
0002 (x.go:3) FU
Hi Jacques,
Thanks for trying that. I found out that I was on a wild goose chase. As it
turns out, it was code that my TestMain
called which had a hard-coded reference looking for the GOPATH.
Cheers,
Chris
On Wednesday, August 21, 2019 at 5:43:51 AM UTC+10, Jacques Supcik wrote:
>
> Hello Chris,
Hi Than,
I got it, thanks for your detailed explanation. And I'm also thinking about
how to write test cases, the cabi-testgen project would be a great help, I
will keep you informed if there are other questions or updates, thank you.
--
You received this message because you are subscribed to
Well, this is really old but I had the same problem and its because you
need to export the field on YOUR struct (time.Time doesn't needs to have
exported fields like someone else said).
Here's the same code with element *t time.Time* declared as *T time.Time: *
https://play.golang.org/p/tXh2LqT8
I am also in the same boat as tom, there is certainly a demand for this
type of library.
-- Sam Fourman
On Tue, Aug 20, 2019 at 3:33 PM 'Thomas Bushnell, BSG' via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> I am of the opinion that a case like this is best handled by simply
> writing th
Hello,
In 'init' section of .gox files, there might be functions like the
followings besides those 'import',
math ~math bits ~math..z2fbits atomic
~runtime..z2finternal..z2fatomic
where and how are those functions generated, any source code or doc I can
refer to? Thanks.
--
Y
Thanks a lot, Ian. the schedule is fine.
On Wednesday, August 21, 2019 at 7:37:10 AM UTC+8, Ian Lance Taylor wrote:
>
> On Mon, Aug 12, 2019 at 8:21 PM Xiangdong JI > wrote:
> >
> > The .go files generated during building gccgo seem to have a few
> constants with weird values, for example:
>
On Tue, Aug 20, 2019 at 9:12 PM Xiangdong JI wrote:
>
> In 'init' section of .gox files, there might be functions like the followings
> besides those 'import',
>
> math ~math bits ~math..z2fbits atomic
> ~runtime..z2finternal..z2fatomic
>
> where and how are those functions generated
Thanks Ian.
Curious to know the purpose of those dummy functions, and for the 'import'
functions do they have real function bodies?
On Wednesday, August 21, 2019 at 12:40:44 PM UTC+8, Ian Lance Taylor wrote:
>
> On Tue, Aug 20, 2019 at 9:12 PM Xiangdong JI > wrote:
> >
> > In 'init' section o
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