derekcollison

# vmc update is great for test and development, however it stops your old app and stages and starts the new one,
# resulting in dropped requests.
# If you want to update an application without dropping user requests, see below.
# NOTE: This change assumes your application can share services, etc with the new version.

# Assume my app is named foo

vmc push foo-v2 --url foov2.cloudfoundry.com

derekcollison

~/Development/vcap/apps/crash_foo> vmc push foo

Would you like to deploy from the current directory? [Yn]: 
Application Deployed URL: 'foo.cloudfoundry.com'? 
Detected a Sinatra Application, is this correct? [Yn]: 
Memory Reservation [Default:128M] (64M, 128M, 256M, 512M, 1G or 2G) 
Creating Application: OK
Would you like to bind any services to 'foo'? [yN]: 
Uploading Application:
  Checking for available resources: OK

derekcollison

~> telnet 127.0.0.1 4222
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
INFO {"server_id":"bae2f058b327a4b5ecff44407f","host":"0.0.0.0","port":4222,"version":"0.4.22","auth_required":false,"ssl_required":false,"max_payload":1048576}
sub foo 1
+OK
pub foo 2
hi
+OK

derekcollison

#!/usr/bin/tclsh8.5
#
# Usage: unmerged branch1 branch2

proc getlog branch {
    lrange [split [exec git log $branch --oneline] "\n"] 0 100
}

proc diff {title c1 c2} {
    puts "\n$title"

derekcollison

{
  "http://api.cloudfoundry.qa.mozycloud.com/":"token-xxx",
  "http://api.staging-cloudfoundry.com":"token-xxx",
  "https://api.cloudfoundry.com":"token-xxx",
  "http://api.derek.cloudfoundry.me":"token-xxx",
  "http://api.vcloudlabs.com":"token-xxx",
  "http://api.appcloud07.dev.mozycloud.com":"token-xxx",
  "http://api.cloudfoundry.com":"token-xxx",
  "http://cc.alpha.vmforce.com":"token-xxx",
  "https://api.vcloudlabs.com":"token-xxx",

derekcollison

I have really come to enjoy working in Go. From time to time I expect that the team at Apcera will
need to dip back into C for some things, but I decided to try to push the envelope with Go on making
some faster HashMaps than Go's builtin map. I started with the hash algorithms.

These are some results from my MBA11" core i7.. The fastest Hash algorithms will not work on machines
without support for unaligned access, and I still need to do some cleaning up before we OSS, but so far so good.

I aslo need to implement the fastest one, FNV1A_Hash_Yorikke, from http://http://www.sanmayce.com/Fastest_Hash

I hack SetBytes(1) to get a rough idea of ops/sec, its not actually IO.. So 10 MB/s is 10 Million ops per sec.

derekcollison

I have done some more work on creating very fast hash algorithms in Go for small (3-8) and medium (16-32) size keys. Below are the current results.

NOTE: I used SetBytes(1) to give quick estimate of ops/sec

2012 MacbookAir 11" i7 2Ghz

================
OSX - Mountain Lion
Go version go1.0.3
================

derekcollison

I have some early benchmark results for our work on a high performance NATS server in Go.

Quick Summary:
We can process ~2M msgs/sec through the system, and the ingress and egress are fairly well balanced.

The basics of the architecture are intelligent buffering and IO calls, fast hashing algorithms and subject distributor/routing, and a zero-allocation hand-written protocol parser.

In addition, I used quite a bit of inlining to avoid function overhead, no use of defer, and little to no object allocation within the fast path. I will share more details and the code at a future date.

derekcollison

Impressed with the performance gains in go 1.1 on maps. I had to write my own for the original gnatsd.
HashMap is my own implementation.

go 1.0.3
~/Development/go/src/github.com/apcera/gnatsd/hashmap> go test --bench="."
PASS
Benchmark_GoMap___GetSmallKey   50000000	        53.1 ns/op	  18.82 MB/s
Benchmark_HashMap_GetSmallKey	10000000		21.4 ns/op	  46.69 MB/s
Benchmark_GoMap____GetMedKey	20000000	     	107 ns/op	   9.27 MB/s
Benchmark_HashMap__GetMedKey	50000000		34.7 ns/op	  28.78 MB/s

derekcollison

ubuntu vm on MBA 11" 2013

ubuntu@apcera-raring-amd64:~/go/src/github.com/apcera/gnatsd/test$ go test --run="zzz" --bench="."
PASS
Benchmark___PubNo_Payload	10000000	       209 ns/op	  52.59 MB/s
Benchmark___Pub8b_Payload	10000000	       293 ns/op	  95.40 MB/s
Benchmark__Pub32b_Payload	 5000000	       433 ns/op	 175.36 MB/s
Benchmark_Pub256B_Payload	 1000000	      1942 ns/op	 270.28 MB/s
Benchmark___Pub1K_Payload	  200000	      8971 ns/op	 229.84 MB/s