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Apache Spark: The number of cores vs. the number of executors
... 21 threads
with 7 cores per executor, we expect limited IO to HDFS (maxes out at ~5 cores)
effective throughput ~= 3 executors x 5 threads = 15 threads
Run 3: 4 GB, 2 cores, 12 executors
2 executors x 12 threads = 24 threads
2 cores per executor, so hdfs throughput is ok
effective throughput ~=...
how to get the cookies from a php curl into a variable
...rlResponseHeaderCallback()? Or do you just have curlResponseHeaderCallback outside of the class?
– Robert Johnstone
May 15 at 10:28
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How can sbt pull dependency artifacts from git?
...it to master and sbt still works with the originally cloned repository without noticing a new commit. At this point one have to either delete it from /.sbt/0.13/staging/ and have sbt clone it again or going there and doing git pull
– lisak
Sep 2 '17 at 12:05
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How to hide output of subprocess in Python 2.7
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Redirect the output to DEVNULL:
import os
import subprocess
FNULL = open(os.devnull, 'w')
retcode = subprocess.call(['echo', 'foo'], stdout=FNULL, stderr=subprocess.STDOUT)
It is effectively the same as running this shell command:
re...
Set “this” variable easily?
...have a pretty good understanding of Javascript, except that I can't figure out a nice way to set the "this" variable. Consider:
...
What is the difference between a heuristic and an algorithm?
... stronger property that there is a proven bound to the solution (value) it outputs.
For some problems, noone has ever found an 'efficient' algorithm to compute the optimal solutions (note 2). One of those problems is the well-known Traveling Salesman Problem. Christophides' algorithm for the Travel...
How to use PHP OPCache?
...());
opcache_get_status():
This will return an array with information about the current status of the cache. This information will include things like: the state the cache is in (enabled, restarting, full etc), the memory usage, hits, misses and some more useful information. It will also contain ...
Why does one hot encoding improve machine learning performance?
...al feature "nationality", with values "UK", "French" and "US". Assume, without loss of generality, that these are encoded as 0, 1 and 2. You then have a weight w for this feature in a linear classifier, which will make some kind of decision based on the constraint w×x + b > 0, or equivalently w...
raw vs. html_safe vs. h to unescape html
...m within a controller or view, since it's from a helper. It will force the output to be escaped. It's not really deprecated, but you most likely won't use it anymore: the only usage is to "revert" an html_safe declaration, pretty unusual.
Prepending your expression with raw is actually equivalent t...
Vagrant reverse port forwarding?
...in the corresponding ssh shell. I think Dan Fabulich wanted a solution without the need to ssh into the vm.
– Alp
Nov 22 '13 at 21:08
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