golang-nuts@googlegroups.com discussions for April 2014

55	[go-nuts] Please help me improve this code (elegance, size and performance)

I am a post. doc. doing research in heuristic search. So far, I used C, which was fast but required a lot of development time for each new project. So, I decided to give Go a try (before this, I ...

Meir
Apr 4, 2014 at 10:10 am
Apr 13, 2014 at 10:50 am

46	[go-nuts] select statement

Is it possible to specify more than a channel operation in a *case *of a *select*? -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe ...

Massimiliano Tomassoli
Apr 26, 2014 at 10:04 am
Apr 30, 2014 at 2:29 pm

40	[go-nuts] Why is this simple iteration over maps as slow as the Ruby equivalent ?

Hi folks, I'm doing some performance measurements between Node and Go and Ruby. I explored an example of iterating 10million small hashes, during which I would perform a small operation (the ...

Ijonas Kisselbach
Apr 9, 2014 at 5:53 am
Apr 10, 2014 at 4:17 pm

38	[go-nuts] 14 bit Floating point values

I have a situation where my golang application will receive a network message where some of the bytes in the message are 14 bit floating point values. Does anyone have any ideas on how I might go ...

Curtis Paul
Apr 25, 2014 at 8:57 pm
Apr 30, 2014 at 7:51 am

34	[go-nuts] Go 1.3 Beta 1 Released

Hi Go nuts, We have just released go1.3beta1, a beta version of Go 1.3. It is cut from the default branch at revision f8b50ad4cac4. Please help us by testing your Go programs with the new tool chain ...

Andrew Gerrand
Apr 22, 2014 at 10:35 pm
May 17, 2014 at 9:57 pm

32	[go-nuts] Debugging in Go seems to be a very difficult task to accomplish

This is my first experience of debugging in Go. I am trying to debug this code: http://play.golang.org/p/8WxRtpWgk- (it implements, so far incorrectly, a generic puzzle solver with an application to ...

Meir
Apr 3, 2014 at 6:26 pm
Apr 7, 2014 at 7:36 am

31	[go-nuts] Calling C function is super slow

Hello, I am a big fan and supporter of Go and try to evangelize everywhere and anytime I can. I am using Go to write the race server side for Assetto Corsa (www.assettocorsa.net) with good results, ...

Stefano Casillo
Apr 27, 2014 at 2:54 am
Apr 27, 2014 at 1:52 pm

31	[go-nuts] [ann] Fixed-point arithmetic for Go

https://github.com/opennota/decimal It is based on the big.Rat type. Comments are welcome. There are also other implementations, e.g. https://github.com/oguzbilgic/fpd -- You received this message ...

OpenNota
Apr 13, 2014 at 9:12 am
Apr 20, 2014 at 4:31 am

28	[go-nuts] Newbie's code: 2.5 times longer than Python and 10 times slower than C. Please help me improve!

For my first experience in Go, I have implemented a generic puzzle solver with an application to the Pancake puzzle: http://play.golang.org/p/_wDImFUDyY (1) The code is 2.5 longer than the equivalent ...

Meir
Apr 3, 2014 at 10:28 pm
Apr 8, 2014 at 1:22 pm

23	[go-nuts] problem with daisy_chain

The following code runs successfully with n = 100000, but not with n = 200000. Why? Out of memory? package main import ( "fmt" ) func f(left, right chan int) { left <- 1 + <-right } func main() { ...

Massimiliano Tomassoli
Apr 30, 2014 at 12:20 pm
May 2, 2014 at 2:28 pm

23	[go-nuts] Why use SCM name in code organization?

Is there any particular reason why almost everywhere I see the SCM name in the code organization? - http://golang.org/doc/code.html What if the repository and SCM change? Some years ago it was CVS, ...

Satishb10
Apr 3, 2014 at 10:45 pm
Apr 5, 2014 at 3:13 pm

22	[go-nuts] Autodetecting GOPATH

I feel like this topic has to have come up several times before, but I can't find it in the archives. Is there any reason that the go tool doesn't want to find its own GOPATH by looking at its ...

Rob Napier
Apr 19, 2014 at 10:01 pm
Apr 23, 2014 at 8:06 pm

22	[go-nuts] Another CSV related question! How do you search and delete a record within a CSV file?

Hey guys, I just wanted to ask if it is possible to search for a record in a csv file say through their ID field. once searched is it possible to delete that searched record through the encoding/csv ...

Michael Rivera
Apr 18, 2014 at 9:12 am
Apr 19, 2014 at 6:49 pm

22	[go-nuts] Override function in imported package

package a func aaa (){ print("a") } ------------------------------------------------------------------- import "a" package main func init(){ a.aaa= func(){ print("redefined") } } func main(){ a.aaa() ...

小菜
Apr 10, 2014 at 8:37 am
Apr 11, 2014 at 6:00 pm

21	[go-nuts] for-range syntax question

I find for-range syntax very counter intuitive and I always wondered if I'm alone and what's the possible motivation for the current syntax choice? example here: http://play.golang.org/p/TGvAUhuYmc ...

Liviu Ghiurau
Apr 28, 2014 at 8:25 pm
Apr 29, 2014 at 10:15 am

21	[go-nuts] Golang Server implements a web interface

Hello! I'm working on a golang server that will send continually data it received from a client to a web page (html5) ! I will now begin to implement the interface, but i have no idea from where i ...

Farah
Apr 16, 2014 at 3:47 pm
Apr 28, 2014 at 5:10 am

21	Re: [go-nuts] Proposal: rand.Shuffle

What would be the best way to do this if I have a map of strings to array, and I want to shuffle contents one of the arrays? I could use the rand.Perm(), but then i need to reinitialize that ...

Klāvs Priedītis
Apr 8, 2014 at 7:49 am
Apr 8, 2014 at 10:30 pm

20	[go-nuts] Memory question....

I am very new (3 weeks?) to Go and was trying to figure out where all my memory was going. I eventually tracked a large piece of down to log.Print* calls (which I make a LOT of in this case). Here's ...

Greg Saylor
Apr 19, 2014 at 6:54 pm
Apr 20, 2014 at 5:34 am

20	[go-nuts] What is the reason behind time.Parse using a reference time?

In java, we do things like new SimpleDateFormat("HH:mm:ss");. In php, something like date_parse_from_format("j.n.Y H:iP", $date) or just strtotime($date). In perl, we create a datetime parser with a ...

Jadekler
Apr 14, 2014 at 3:25 pm
Apr 17, 2014 at 9:44 pm

19	[go-nuts] inconsistent error handling?

As we know, a sync.Mutex.Unlock must be matched with a prior sync.Mutex.Lock, and an os.File.Close must be matched with a prior os.File.Open and the like. What confuses me is the different behaviors ...

Steve wang
Apr 16, 2014 at 6:56 am
Apr 17, 2014 at 10:02 am

19	[go-nuts] Possessive quantifiers in regexp

Hi, I see that currently go's regexp doesn't support possessive quantifiers. Is this temporary, or is this a defined feature (or misfeature)? cheers -- You received this message because you are ...

Amit Lavon
Apr 3, 2014 at 2:45 pm
Apr 5, 2014 at 4:50 pm

19	[go-nuts] Attach files to compiled go program

Hi, I spend some evenings to this idea and would appriciate your feedback. I'm a fairly fresh gopher, so please me tell if I get something fundamentally wrong here. The Idea I really like having a ...

Konstantin Kanellopoulos
Apr 1, 2014 at 11:08 pm
Apr 3, 2014 at 7:20 pm

18	[go-nuts] go concurrency summary

As far as I can tell, the main elements of concurrency and high-level synchronization in Go are - goroutines - channels [make, <-, select, close] - defer - WaitGroup Anything else? -- You received ...

Massimiliano Tomassoli
Apr 26, 2014 at 6:10 pm
Apr 27, 2014 at 6:05 pm

18	[go-nuts] if err == nil, a helpful pattern

Hi folks, When I look at a lot of go code, I see the following pattern: x, err := foo() if err != nil { return err } y, err := bar(x) if err != nil { return err } z, err := baz(y) if err != nil { ...

Scpayson
Apr 17, 2014 at 1:49 am
Apr 22, 2014 at 12:38 pm

18	[go-nuts] launchpad.net/gocheck => gopkg.in/check.v1

The gocheck project has moved to GitHub, and adopted a versioned API. The API is still 100% compatible, though. What changed was: - Import path: gopkg.in/check.v1 [1] - Package name: check rather ...

Gustavo Niemeyer
Apr 1, 2014 at 4:37 am
Apr 2, 2014 at 3:08 pm

17	[go-nuts] imp: a modern typesetting system (prototype and brainstorming)

Hi Gophers, Ever so often I use pdflatex to write something and get very annoyed while doing so. Don't get me wrong, LaTeX is a great and very powerful tool and I have used it excessively. For ...

Christoph Hack
Apr 19, 2014 at 8:41 pm
Apr 22, 2014 at 7:20 pm

17	[go-nuts] Pinpointing the performance leak

I am new to Go and am trying to understand how to properly use it for my applications, where performance is extremely important. Attached are two equivalent programs, one in Go and one in C. I want ...

Meir
Apr 9, 2014 at 4:51 pm
Apr 11, 2014 at 3:13 pm

16	[go-nuts] About atomic.AddUint32()

Hi, all In the doc of package 'atomic': To subtract a signed positive constant value c from x, do AddUint32(&x, ^uint32(c-1)). Why can do that? I found that the result of ^uint32(C-1) equals to the ...

Robert Hao
Apr 25, 2014 at 7:26 am
Apr 29, 2014 at 4:21 am

16	[go-nuts] How to concurrently process large json file / map. Facing problem in currently calling recursive calls

I have to parse and process large json file 60MB plus size. What should be the fastest way to processes? In the sample I am parsing small json from memory while in actually it will be file I/O ...

Abhijit Kadam
Apr 24, 2014 at 6:52 am
Apr 28, 2014 at 3:32 pm

16	[go-nuts] Randomly selecting k integers from the range [min, max)

Assuming that max-min can be a very large number, can anyone help me verify that the below algorithm is correct? // Sample randomly selects k integers from the range [min, max). // Given that ...

Fumin Wang
Apr 17, 2014 at 5:27 pm
Apr 19, 2014 at 11:42 am

16	[go-nuts] Godoc's html formatting

Hi all, I've been experimenting with godoc in order to find a good way to format the documentation comments, so that godoc's output html will be nice and clear. From Go's package documentations, I ...

Amit Lavon
Apr 1, 2014 at 12:59 pm
Apr 3, 2014 at 10:14 am

15	[go-nuts] os.Pipe() + channels = poor performance (scheduler issue?)

Hi all, I have been doing some benchmarking for 2 processes communicating via a couple of os.Pipe()s on Linux/amd64 using go 1.2.1 and got some interesting results. pong.go: package main import ( ...

Dmitry Panov
Apr 29, 2014 at 12:51 pm
May 7, 2014 at 2:10 pm

15	[go-nuts] Anonymous struct initlializer

Hi, we have a handy syntax for initializing arrays with the compiler figuring out the number of elements. foo := [...]int{1, 2, 3} May we please have the same for structs? This would be really handy ...

"'Mike Bosland
Apr 28, 2014 at 10:09 am
Apr 28, 2014 at 8:50 pm

15	[go-nuts] Re: [golang-dev] Is there a problem with code.google.com/p/go.net/websocket ?

Replying to golang-nuts, the appropriate forum for this post. How do you know the C# client library is correct? Does it say what websocket spec it implements? Have you tried connecting to your ...

Andrew Gerrand
Apr 16, 2014 at 1:40 am
Apr 23, 2014 at 5:17 pm

15	[go-nuts] Potential bug in io.MultiReader, io.MultiWriter

io.MultiReader and io.MultiWriter take varargs, and return a struct which contains the varargs slice directly (source: http://golang.org/src/pkg/io/multi.go). This is fine if the arguments are given ...

Joshua Liebow-Feeser
Apr 17, 2014 at 3:35 pm
Apr 19, 2014 at 2:02 am

15	[go-nuts] Is there a way to tell the compiler to get rid of the things that slow down the production run?

Things like debugging information and bound checking are only needed during the development and the initial usage. However, when I run a computationally intensive experiment in the production mode, I ...

Meir
Apr 7, 2014 at 1:13 pm
Apr 7, 2014 at 6:03 pm

14	[go-nuts] slice.Sort function

Here's a package to sort slices with only a less function: http://godoc.org/github.com/bradfitz/slice slice.Sort(yourSlice, func(i, j int) bool { return yourSlice[i].name < yourSlice[j].name }) It's ...

Brad Fitzpatrick
Apr 30, 2014 at 2:56 pm
May 2, 2014 at 6:27 pm

14	[go-nuts] My first library, targz. Looking for feedback.

Hello, I just put my first Go library up on Github. https://github.com/walle/targz Just starting out with Go, and I feel that I don't really have error handling figured out. I would appreciate it a ...

Fredrik Wallgren
Apr 15, 2014 at 6:14 pm
Apr 17, 2014 at 7:51 am

14	[go-nuts] Ranging over slices vs using for with an index

I have read the spec on the use of the keyword range: http://golang.org/ref/spec#RangeClause Using this code as a reference for my questions: func Range() { for _, value := range data { Foo(value) } ...

William Kennedy
Apr 10, 2014 at 5:59 am
Apr 13, 2014 at 5:40 pm

13	[go-nuts] Cross-linking cgo

I work on an appliance that includes a cross-platform Go client distributed by the appliance. I'd like to embed appliance-specific configuration into the client executable. It occurred to me that I ...

Rob Napier
Apr 27, 2014 at 6:05 pm
May 5, 2014 at 7:07 pm

13	[go-nuts] [Performance Problem] fmt.Scanf is around 50 times slower than c's scanf

Hi Go Team, Good Morning. I stumbled upon this performance difference when i was trying to use 'go' for a simple program that i had originally written in C. It appears that 'go' in this scenario is ...

S Dhilipkumar
Apr 21, 2014 at 2:44 pm
Apr 22, 2014 at 5:57 am

13	[go-nuts] Time Period List Problem,I have three implement with different interface,which one is better?

Problem: I have some lists of objects with a time period info(start time and end time) read from msexcel.There is several type of that object.Those time period will not overlap. I need three ...

Bronze man
Apr 14, 2014 at 6:35 am
Apr 16, 2014 at 5:28 am

13	[go-nuts] channel deadlock oddity.

The source and comments speak for themselves. Basically I don't understand why my code deadlocks in this way. Can anyone explain this to me please? func main() { a := make(chan bool, 1) b := ...

MartinG
Apr 8, 2014 at 5:21 pm
Apr 10, 2014 at 2:13 pm

13	Re: [go-nuts] Are there any plans to add concurrent algorithms or types?

This way you lock the entire map for every write operation. Good concurrent maps, like Java's ConcurrentMap, would stripe the locks, and a write would lock only a subset of the keys, reducing ...

Elazar Leibovich
Apr 6, 2014 at 8:17 am
Apr 8, 2014 at 12:58 pm

13	[go-nuts] multiple go instances to prevent GC from stopping the world?

I'm trying to build a soft real-time app in Go, but I believe the GC can cause quite a delay which is unacceptable. I'm wondering if a viable work-around would be starting separate instances of the ...

John Lee
Apr 5, 2014 at 4:02 am
Apr 7, 2014 at 6:41 pm

13	[go-nuts] Slice of any type

What is the syntax to write "slice whose elements can be of any type"? I am trying to implement a function for reversing a slice. I tried to write this in the parameter list: slice []Interface{}, but ...

Meir
Apr 3, 2014 at 3:42 pm
Apr 3, 2014 at 6:34 pm

12	[go-nuts] Add "in" keyword for if statement

Hey all, Yesterday I was writing a code where I needed to check if a value was in an array. The only way I found to do it was writing my own IsInArray function, there were no other way to do it, at ...

Jonhkr
Apr 29, 2014 at 3:02 am
Apr 30, 2014 at 1:59 am

12	[go-nuts] builtin new is 2x as fast from &{}

Hi all see http://play.golang.org/p/y7m8A8umHL BenchmarkAlloc1 100000000 17.0 ns/op BenchmarkAlloc2 50000000 32.8 ns/op until now i think using '&{}' is equal to new, but benchmark show opposite. why ...

Djadala
Apr 23, 2014 at 6:58 am
Apr 23, 2014 at 12:14 pm

12	[go-nuts] Can't get ReverseProxy to work

I don't know why this reverse proxy is not working. I've seen several examples and I can't find anything wrong with it. package main import ( "log" "net/url" "net/http" "net/http/httputil") func ...

Grignoli
Apr 19, 2014 at 2:21 am
Apr 19, 2014 at 7:54 am

12	[go-nuts] best practics to convert C's bitfields into GO?

should be discussed before, but I didn't find~ C bitfields is very often used for hardware's register struct register { int power : 2; int mode: 4 ; int reserved: 26; }; does GO has equivalent ? ...

Fino
Apr 3, 2014 at 8:52 am
Apr 7, 2014 at 1:28 pm

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