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José Guilherme Vanz jvanz

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@jvanz
jvanz / compile error
Created January 8, 2015 15:44
cassandra driver compile error
[info] Compiling 1 Scala source to /home/vanz/repos/juicer/bigdata/target/scala-2.10/classes...
[error] /home/vanz/repos/juicer/bigdata/app/controllers/Cassandra.scala:59: value addColumm is not a member of com.datastax.driver.core.schemabuilder.Create
[error] possible cause: maybe a semicolon is missing before `value addColumm'?
[error] .addColumm("record_type", DataType.bigint())
@jvanz
jvanz / gist:3cad953710c6c7b67a60
Created January 14, 2015 14:41
android layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
@jvanz
jvanz / chef-client output
Last active August 29, 2015 14:16
chef-provisioning
Starting Chef Client, version 12.0.3
resolving cookbooks for run list: ["chef-client", "chef-client::delete_validation", "provisioning"]
Synchronizing Cookbooks:
- cron
- logrotate
- windows
- chef_handler
- provisioning
- chef-client
Compiling Cookbooks...
@jvanz
jvanz / admin.py
Created April 9, 2015 14:26
locust test file
from locust import HttpLocust, TaskSet, task
import uuid
import resource
class UserBehavior(TaskSet):
uuid = uuid.uuid4()
cookies = None
@task(1)
@jvanz
jvanz / gist:d8b73de8a0d4457e11e7
Created April 14, 2015 20:21
ohai reload
ohai "reload" do
action :nothing
plugin 'ec2'
end.run_action(:reload)
@jvanz
jvanz / stacktrace
Created April 17, 2015 13:44
locust error
[2015-04-17 10:39:36,405] odin/INFO/locust.runners: Client 'server.local_bcd20a7610ce99d654d2ef65cef7a28c' quit. Currently 0 clients connected.
[2015-04-17 10:43:40,631] odin/INFO/locust.runners: Client 'server.local_7f916f1d5997cf44f9f169ccf38e5c5e' reported as ready. Currently 1 clients ready to swarm.
[2015-04-17 10:43:47,857] odin/INFO/locust.runners: Sending hatch jobs to 1 ready clients
[2015-04-17 10:43:47,857] odin/ERROR/stderr: Traceback (most recent call last):
[2015-04-17 10:43:47,858] odin/ERROR/stderr: File "/usr/lib64/python2.7/site-packages/gevent/pywsgi.py", line 508, in handle_one_response
[2015-04-17 10:43:47,858] odin/ERROR/stderr: self.run_application()
[2015-04-17 10:43:47,858] odin/ERROR/stderr: File "/usr/lib64/python2.7/site-packages/gevent/pywsgi.py", line 494, in run_application
[2015-04-17 10:43:47,858] odin/ERROR/stderr: self.result = self.application(self.environ, self.start_response)
[2015-04-17 10:43:47,858] odin/ERROR/stderr: File "/usr/lib/python2.7/site-packages/flask/app.py"
@jvanz
jvanz / gist:4545d6c4e75f96d5cfab
Created May 22, 2015 18:15
Stacktrace
[info] java.lang.ClassCastException: java.lang.String cannot be cast to com.datastax.spark.connector.SelectableColumnRef
[info] at com.datastax.spark.connector.SomeColumns$$anonfun$aliases$3.apply(ColumnSelector.scala:18)
[info] at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
[info] at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
[info] at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
[info] at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:34)
[info] at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
[info] at scala.collection.AbstractTraversable.map(Traversable.scala:105)
[info] at com.datastax.spark.connector.SomeColumns.aliases(ColumnSelector.scala:18)
[info] at com.datastax.spark.connector.rdd.CassandraTableRowReaderProvider$class.com$datastax$spark$connector$rdd$CassandraTableRowReaderProvider$$aliasToColumnName(CassandraTableRowReaderProv
@jvanz
jvanz / trace_build_shipyard_swarm_v3
Last active August 26, 2015 17:05
Shipyard build output
main.go:7:2: cannot find package "github.com/codegangsta/cli" in any of:
/usr/src/go/src/pkg/github.com/codegangsta/cli (from $GOROOT)
/go/src/github.com/shipyard/shipyard/controller/Godeps/_workspace/src/github.com/codegangsta/cli (from $GOPATH)
/go/src/github.com/codegangsta/cli
api/api.go:21:2: cannot find package "github.com/mailgun/oxy/forward" in any of:
/usr/src/go/src/pkg/github.com/mailgun/oxy/forward (from $GOROOT)
/go/src/github.com/shipyard/shipyard/controller/Godeps/_workspace/src/github.com/mailgun/oxy/forward (from $GOPATH)
/go/src/github.com/mailgun/oxy/forward
Godeps/_workspace/src/github.com/dancannon/gorethink/connection.go:13:2: cannot find package "gopkg.in/fatih/pool.v2" in any of:
/usr/src/go/src/pkg/gopkg.in/fatih/pool.v2 (from $GOROOT)
@jvanz
jvanz / memory.h
Last active July 24, 2023 05:03
my own malloc/free implementation
#ifndef _MEMORY_HEADER
#define _MEMORY_HEADER
/**
* Allocates a block of memory with bytes of length
* @returns a pointer to the allocated block of memory. Return NULL in error
*/
void* memory_alloc(size_t bytes);
/**
@jvanz
jvanz / latency.markdown
Created November 26, 2015 18:04 — forked from hellerbarde/latency.markdown
Latency numbers every programmer should know

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs