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Bad perfomance with CSV and maps in Go
You are (unnecessarily) loading the complete CVS file at once and overwriting the files every time the contents would change. Try the following: package main import ( "encoding/csv" "fmt" "os" "sync" ) func main() { input, err := os.Open("union_exp.csv") if err != nil { fmt.Println("Error while opening CSV file.") return } defer input.Close()

Categories : Performance

Meteor: filter data in publish or on client
It's a matter of opinion, but if possible I would strongly recommend attaching employee_id to docs in AssignmentDetails, as you have in the second example. You're correct in suggesting that publications are expensive, but much more so if the publication function is more complex than necessary, and you can reduce your pub function to one line if you have employee_id in AssignmentDetails (even wher

Categories : Performance

Carousel Product Cart Slider Change speed
Never mind foud it :) > <script> > > jQuery(document).ready(function(){ > jQuery('.carousel-inner .item').first().addClass('active'); > jQuery('.carousel').carousel({interval: 15000}); }); > > </script>

Categories : Performance

CLOS make-instance is really slow and causes heap exhaustion in SBCL
18636 warnings looks really bad, Start by getting rid of all the warnings. I would start by getting rid of the EVAL-WHEN around all that. Does not make much sense to me. Either load the file directly, or compile and load the file. Also note that SBCL does not like (setf STOSB-void ...) when the variable is undefined. New top-level variables are introduced with DEFVAR or DEFPARAMETER. SETF just s

Categories : Performance

WebGL flush & finish
If you aren't already, make sure that you're doing all of your drawing from within a requestAnimationFrame callback. That is, don't redraw in response to events, but rather schedule a single callback if anything changes. // need to redraw window.addEventListener('mousemove', function (event) { // or whatever ... update drawing parameters, but don’t draw ... markDirty(); }, false); ... va

Categories : Performance

Are boolean operations slower than mathematical operations in loops?
Short version There is no correct answer because your question is not specific enough (the two examples of code you give don't achieve the same purpose). If your question is: Is bool isGreater = (a > b); slower or faster than int sum = a + b;? Then the answer would be: It's about the same unless you're very very very very very concerned about how many cycles you spend, in which case it

Categories : Performance

How to measure performance (consumed memory) of apache2 and nginx?
The ab.c open-source program does it (per-process, per-thread, etc.), see an example of report here, a comparison between two servers there (the point of your question) showing how much memory usage can differ depending on servers and configuration options.

Categories : Performance

MAGMI terribly slow after server migration
Did you try truncating the logs? It really helps sometimes(depending on their size) The last four might be what you actually need to truncate, but usually from time to time it's ok to clear the others too: log_url, log_url_info, log_visitor, log_visitor_info, dataflow_batch_import, dataflow_batch_export, index_event and report_event.

Categories : Performance

MongoDB is slow after deleting large data
Try compact the collection. If it is in live production, you'll want to do this on a secondary. After compact is done on secondary, let it catch up to primary, then let primary stepdown and the compacted secondary becomes the new primary. However, make sure you have enough room to do compaction. Compact requires at least 1:1 free space ratio. In your case, you'll need 172GB of free space to compl

Categories : Performance

Google Datastore slow using gcloud-node
Operations on Google Cloud Datastore are currently expected to take longer than analogous operations on App Engine Datastore due to architectural differences (so the App Engine System Status page isn't directly applicable). We are actively working on reducing the latency gap. For updates, please follow this issue on our issue tracker.

Categories : Performance

How to handle the recording issues in jmeter? (i.e) Smack plugin activities are not recording in JMeter
JMeter Test Script Recorder can only record HTTP traffic through proxy so if you configured proxy for smack plugin then recording cannot happen due to protocol not being understood. Otherwise it's proxy misconfiguration.

Categories : Performance

SVG with 10.000+ nodes - fast in IE and Safari, slow in Chrome and Firefox
Reducing accuracy would only help parsing speed. Once the SVG was parsed, it shouldn't make a difference. I am not sure what, if any, optimisations FF and Chrome use when testing hover for SVG elements. But I would certainly try reducing the complexity of the pieces. For instance, the piece "g1" has 89 path commands in its definition. You should be able to reduce that by 4x, at least, and sti

Categories : Performance

Should I use bit-shift or division?
For signed types division and right shift are different operations from compiler's point of view even if you know that the value is non-negative, unless it's known at compile time and the compiler is able to make use of it. For unsigned types I believe all decent modern compilers will change division to shift. For example, for this code: unsigned my_div(unsigned x) { return x / 32; } unsign

Categories : Performance

ElasticSearch fetch only amount of results like sphinx
Yes there is from/size option for elasticsearch for example first 10 docs { "from" : 0, "size" : 10, "query" : { .... } } here is the api doc

Categories : Performance

Time Complexity of a Algorithm Which Runs in lg(n!) Time
You can write lg(n!) as: And now you can approximate it with integrals: Finally solve integrals: And your answer is: lg(n!) has got O(nlog(n)) complexity

Categories : Performance

Performance of Node-Webkit Desktop Applications
So there's 2 parts to this question: 1) Speed comparison of Javascript executing under V8 (node-webkit), vs C++ compiled into native code On most computationally-intensive tasks, you'd expect a 3x to 10x slowdown in execution (depending on the benchmark). An example can be found at http://benchmarksgame.alioth.debian.org/u64/benchmark.php?test=all&lang=v8&lang2=gpp ; if you want more exa

Categories : Performance

poor performance for neo4j on Microsoft Azure
The Neo4j VM available through the Microsoft Azure image depot is out of date. I advise deploying Neo4j to Microsoft Azure using Docker. You can find the latest available Docker image for Neo4j community here: https://registry.hub.docker.com/u/kbastani/docker-neo4j/ Also, you can use Elastic Beanstalk through Amazon EC2 using SSDs for better performance. If you're set on Microsoft Azure's limite

Categories : Performance

Determining upper bound in terms of big O
Big O says what is the relationship between the input size and the time/space complexity. Now onto your examples: For J = 1 to 10000000000000 - The 10000000000000 is just a constant. Even though it is a big number, it doesn't depend on the input size (N), which is why this is O(1) For J = 1 to N - The number of iterations now directly depends on N, this is said to be linear complexity, since if

Categories : Performance

Efficiently retrieve Z ordered objects in viewport in 2D game
A typical solution to this sort of problem is to group your objects according to their approximate XY location. For example, you can bucket them into 500x500 regions, i.e. objects intersecting [0,500]x[0,500], objects intersecting [500,1000]x[0,500], etc. Very large objects might be listed in multiple buckets, but presumably there are not too many very large objects. For each viewport, you would

Categories : Performance

issue interpreting internet connection speed
They probably meant (for eg "10MB-20MB --- 1 or 2 days $xx1") 1: varying between 10-20 MBps (80-160Mbps) 2: between 10-20Mbps (if incorrectly capitalised) 3: they could mean 10-20 MB download limit and not be referring to speed at all. In all cases they mean you can have that speed/capacity for 1 or 2 days. they are probably just referring to the download speed, or both the upload and downlo

Categories : Performance

Theoretical speedup not achieved - kernel separability
Your kernel is not big enough to really see any gains. The improvement should become more apparent as you make the kernel larger: test = randn(3000); kx = 1:100; ky = kx'; kernel = ky*kx; tic; b = conv2(test,kernel,'same'); toc; tic; bx=conv2(test,kx, 'same'); by=conv2(bx,ky, 'same'); toc; When I run it with this 100x100 kernel size, I see: Elapsed time is 6.961222 seconds. Elapsed time is 0.

Categories : Performance

Slow performance in spark streaming
So i was using case matching in allot of my jobs and it killed performance, more than when i introduced a json parser. Also try tweaking the batch time on the StreamingContext. It made quite a bit of difference for me. Also how many local workers do you have?

Categories : Performance

JMeter Issue in VLAN enabled system
According to me issue is related to proxy. Jmeter sits between your machine and proxy and thats how it records all the requests coming to and going from your machine. It doesnt matter you are in VLAN or WAN if your proxy settings are correct. Please check your proxy settings once put apply similar proxy settings (Localhost,8080) in VLAN or else you can provide seperate proxy for your Jmeter by s

Categories : Performance

Is performance of "less/greater than than" better than "less/greater than or equal to"
On virtually every modern CPU, there are compare/jumpless and compare/jumplessequal instructions that take exactly the same amount of time, because it runs through exactly the same hardware modulo including or not the "equals" bit. It is the case that computing the "not less than" (and therefoe "less than") is sort of free; for unsigned values, it is equivalent to carry from a twos's complement s

Categories : Performance

Prepending to mutable.LinkedList without copying in Scala
I think this is how you are supposed to use it, from a quick glance: val newList = new LinkedList(newElem, existingList) Note though that it is deprecated in Scala 2.11 and might get removed in the future.

Categories : Performance

mmv_stats_interval_start usage example in c
The mmv_stats_interval_start function pairs with mmv_stats_interval_end to accumulate time intervals (microseconds) between matching pairs of those calls. See for example http://git.pcp.io/cgi-bin/gitweb.cgi?p=pcp.git;a=blob;f=qa/src/mmv_genstats.c;hb=HEAD MMV is not about notifications, only about efficiently exposing internal statistics of the program that uses -lpcp_mmv. Notifications would

Categories : Performance

jmeter latency vs actual browser load test
In simple words, Latency is network delay (time taken by network while transferring data) In JMeter latency is time between, when request is sent to server till first byte of response reaches the client/Jmeter. If response time is very low enough then you wont get precise measure of latency. If Response time is high then probably you will get correct measure. In Jmeter Latency shares the measure

Categories : Performance


Recently Add
Would you violate the idempotency principle of REST for the sake of performance?
Bad perfomance with CSV and maps in Go
Meteor: filter data in publish or on client
Carousel Product Cart Slider Change speed
CLOS make-instance is really slow and causes heap exhaustion in SBCL
WebGL flush & finish
Are boolean operations slower than mathematical operations in loops?
How to measure performance (consumed memory) of apache2 and nginx?
MAGMI terribly slow after server migration
MongoDB is slow after deleting large data
Google Datastore slow using gcloud-node
How to handle the recording issues in jmeter? (i.e) Smack plugin activities are not recording in JMeter
SVG with 10.000+ nodes - fast in IE and Safari, slow in Chrome and Firefox
Should I use bit-shift or division?
ElasticSearch fetch only amount of results like sphinx
Time Complexity of a Algorithm Which Runs in lg(n!) Time
Performance of Node-Webkit Desktop Applications
poor performance for neo4j on Microsoft Azure
Determining upper bound in terms of big O
Efficiently retrieve Z ordered objects in viewport in 2D game
issue interpreting internet connection speed
Theoretical speedup not achieved - kernel separability
Slow performance in spark streaming
JMeter Issue in VLAN enabled system
Is performance of "less/greater than than" better than "less/greater than or equal to"
Prepending to mutable.LinkedList without copying in Scala
mmv_stats_interval_start usage example in c
jmeter latency vs actual browser load test
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