One Paragraph of project description goes here
These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.
People
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
-- show running queries (pre 9.2) | |
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query | |
FROM pg_stat_activity | |
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' | |
ORDER BY query_start desc; | |
-- show running queries (9.2) | |
SELECT pid, age(clock_timestamp(), query_start), usename, query | |
FROM pg_stat_activity | |
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' |
If your running a x64 bit Ubuntu or other Linux and find USB transfers hang at the end apply this fix:
echo $((16*1024*1024)) > /proc/sys/vm/dirty_background_bytes
echo $((48*1024*1024)) > /proc/sys/vm/dirty_bytes
I suggest you edit your /etc/rc.local
file to make this change persistant across reboots.
sudo nano /etc/rc.local
# | |
# Wide-open CORS config for nginx | |
# | |
location / { | |
if ($request_method = 'OPTIONS') { | |
add_header 'Access-Control-Allow-Origin' '*'; | |
# |
import java.security.InvalidKeyException; | |
import java.security.NoSuchAlgorithmException; | |
import java.security.SignatureException; | |
import java.util.Formatter; | |
import javax.crypto.Mac; | |
import javax.crypto.spec.SecretKeySpec; | |
/** |
If anyone is interested in setting up their system to automatically (or manually) sign their git commits with their GPG key, here are the steps:
$ git config --global commit.gpgsign true
([OPTIONAL] every commit will now be signed)$ git config --global user.signingkey ABCDEF01
(where ABCDEF01
is the fingerprint of the key to use)$ git config --global alias.logs "log --show-signature"
(now available as $ git logs
)$ git config --global alias.cis "commit -S"
(optional if global signing is false)$ echo "Some content" >> example.txt
$ git add example.txt
$ git cis -m "This commit is signed by a GPG key."
(regular commit
will work if global signing is enabled)# | |
# Slightly tighter CORS config for nginx | |
# | |
# A modification of https://gist.github.com/1064640/ to include a white-list of URLs | |
# | |
# Despite the W3C guidance suggesting that a list of origins can be passed as part of | |
# Access-Control-Allow-Origin headers, several browsers (well, at least Firefox) | |
# don't seem to play nicely with this. | |
# |