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PERFORMANCE QUESTIONS

Why AQTime slows execution even when profiling is not on, and can anything be done for it?
Why AQTime slows execution even when profiling is not on, and can anything be done for it?
fixed the issue. Will look into that further Well, you could try my free profiler of course :-)http://code.google.com/p/asmprofiler/
TAG : performance
Date : November 23 2020, 07:00 PM , By : user3862432
Improve the efficiency of my PowerShell script
Improve the efficiency of my PowerShell script
seems to work fine The following should speed up your task substantially:If the intent is truly to look for the search words in the file names:
TAG : performance
Date : November 22 2020, 07:01 PM , By : Vasil Silianov
Very slow guards in my monadic random implementation (haskell)
Very slow guards in my monadic random implementation (haskell)
Does that help Your definition of (>>=) is certainly wrong, but I cannot point to where because it is so complicated! Instead I will explain why it cannot be defined correctly using an example. Consider:
TAG : performance
Date : November 18 2020, 07:00 PM , By : Torinari Yuichiro
Oracle: Insertion on an indexed table, avoiding duplicates. Looking for tips and advice
Oracle: Insertion on an indexed table, avoiding duplicates. Looking for tips and advice
Any of those help if the column A.SOMEKEY is declared NOT NULL and if you insert a large amound of data, a NOT IN clause might be more efficient than your NOT EXISTS since it will be able to use a HASH ANTI-JOIN.
TAG : performance
Date : November 15 2020, 07:01 PM , By : user3860004
What's the best way to store Logon User information for Web Application?
What's the best way to store Logon User information for Web Application?
I hope this helps . I was once in a project of web application developed on ASP.NET. For each logon user, there is an object (let's call it UserSessionObject here) created and stored in RAM. For each HTTP request of given user, matching UserSessoinOb
TAG : performance
Date : November 13 2020, 07:01 PM , By : Ramya Murthy
Best way to retrieve certain field of all documents returned by a Lucene search
Best way to retrieve certain field of all documents returned by a Lucene search
I wish did fix the issue. A better way to retrieve field values is with FieldCache.For example, if the field value is string, you can retrieve values as follows.
TAG : performance
Date : November 11 2020, 07:00 PM , By : Shanzay
CakePHP - Set recursive to -1 in AppModel then use Containable behaviour as appropriate
CakePHP - Set recursive to -1 in AppModel then use Containable behaviour as appropriate
may help you . I use the Containable behaviour on every query. If there is no need for a deeper relationship I use $params['contain'] = array(); -> I don't use recursive at all anymore
TAG : performance
Date : November 04 2020, 07:01 PM , By : Monk
Memory Bandwidth Performance for Modern Machines
Memory Bandwidth Performance for Modern Machines
wish help you to fix your issue On newer CPU's such as the Nehalem, and on AMD's since the Opteron, the memory is "local" to one CPU, where a single CPU may have multiple cores. That is, it takes a certain amount of time for a core to access the loca
TAG : performance
Date : November 03 2020, 07:01 PM , By : user3856093
Is there a way to throttle or limit resources used by a user in Oracle?
Is there a way to throttle or limit resources used by a user in Oracle?
it fixes the issue you can use the Database Resource Manager to manage workload. Have a look at the Oracle documentation or at this example from Joel Kallman's APEX blog.
TAG : performance
Date : October 28 2020, 04:55 PM , By : user3853690
what does the s3 prefix means with respect to scale?
what does the s3 prefix means with respect to scale?
To fix this issue The page says requests per second per prefix in a bucket, which is effectively the same as saying "per directory per bucket".Frankly, you are unlikely to go anywhere near these performance limits. Large companies with millions of cu
TAG : performance
Date : October 21 2020, 06:10 AM , By : Benedict Dlamini
Cassandra slow performance on AWS
Cassandra slow performance on AWS
should help you out There are multiple issues here: for 2nd test you didn't allocate enough memory and cores for DDAC, so Cassandra got only 1Gb heap - Cassandra by default takes 1/4th of all available memory. The same is for 3rd test - it will get o
TAG : performance
Date : October 19 2020, 06:10 AM , By : Rovin D'Souza
Racket streams slower than custom streams?
Racket streams slower than custom streams?
Any of those help Here is an observation:Using a version of integers-starting-from-stream that prints the numbers as they are generated:
TAG : performance
Date : October 18 2020, 06:10 AM , By : Saravanan
Why does performance drop when a function is moved to another module?
Why does performance drop when a function is moved to another module?
may help you . As leftaroundabout suggested in a comment, adding INLINE pragma solved the problem:
TAG : performance
Date : October 13 2020, 04:00 AM , By : Mr_root
My Cors Preflight Options Request Seems Slow
My Cors Preflight Options Request Seems Slow
should help you out I'm not sure if you are using a load balancer or some other proxy service, but one quick fix would be to move the CORS response headers to the load balancer level. This will minimize the overhead that your app may add at any given
TAG : performance
Date : October 13 2020, 02:00 AM , By : conbow
Is there a "Try" equivelent of DATETIME2FROMPARTS?
Is there a "Try" equivelent of DATETIME2FROMPARTS?
seems to work fine Here is the bespoke solution I ended up writing for this. There is unfortunately repeated logic since I'm using this in a persisted computed column and thus cannot use variables or scalar functions (for parameters to be used as var
TAG : performance
Date : October 13 2020, 01:00 AM , By : Mohsin Khan Shuvo
Python-iris performing very slowly in reading netcdf datasets
Python-iris performing very slowly in reading netcdf datasets
will be helpful for those in need One thing to keep in mind is that iris is really doing a lot more work than netCDF4 in this case. This is because it knows about the CF conventions and will automatically identify coordinates (both dimensional and au
TAG : performance
Date : October 12 2020, 04:00 PM , By : jessica
Matrix vs function for matrix operations
Matrix vs function for matrix operations
around this issue This honestly has no right answer since it depends on what you're willing to sacrifice and also on the language being used. Regardless, the main difference would be the function method would take more time than the matrix method, an
TAG : performance
Date : October 10 2020, 04:00 AM , By : Carlton Bonney
Find similarities between two lists
Find similarities between two lists
will be helpful for those in need Here is the dynamic programming approach. If you have integers it will work well. The win here is that you only track one way to get to any particular sum, which means that your performance is bounded by the number o
TAG : performance
Date : October 09 2020, 02:00 PM , By : Tariq
H2o: Is there a way to fix threshold in H2ORandomForestEstimator performance during training and testing?
H2o: Is there a way to fix threshold in H2ORandomForestEstimator performance during training and testing?
hop of those help? The threshold is max-F1.If you want to apply your own threshold, you will have to take the probability of the positive class and compare it yourself to produce the label you want.
TAG : performance
Date : October 09 2020, 01:00 PM , By : star_k
Does it make sense to use n_jobs = -1 both for inner and outer loop?
Does it make sense to use n_jobs = -1 both for inner and outer loop?
like below fixes the issue A short version: No, it does not. A longer version will need to take a bit of understanding, how the n_jobs are actually being handled.
TAG : performance
Date : October 09 2020, 12:00 PM , By : TriciaJ
How is APL optimized to have great performance at array processing? What are some example tricks and optimizations it pe
How is APL optimized to have great performance at array processing? What are some example tricks and optimizations it pe
Any of those help I am interested in how APL is so efficient at what it does, to the point of sometimes being benchmarked as outperforming C. So I'm curious, what are some of the optimizations done by the APL compiler to make the language so efficien
TAG : performance
Date : October 09 2020, 11:00 AM , By : Mayibongwe Bayana Ha
How do I interpret this difference in matrix multiplication GFLOP/s?
How do I interpret this difference in matrix multiplication GFLOP/s?
hope this fix your issue Regarding question 2: While both CPUs have the same base and turbo frequency, the Ivy Bridge has a TDP of 35W while the Skylake has 15W. Even with a much newer process it is possible that the Ivy Bridge is able to use its tur
TAG : performance
Date : October 08 2020, 09:00 AM , By : Justin Merkle
Why is this simple Haskell program so slow?
Why is this simple Haskell program so slow?
I hope this helps . On my system your Haskell code takes about 3.2 seconds.N.B. your C code takes...
TAG : performance
Date : October 07 2020, 08:00 PM , By : Real
Why is my pixel manipulation function so slow?
Why is my pixel manipulation function so slow?
I hope this helps . The putPixel function is extremely inefficient in your case.It loops through and updates all pixels in your sketch just set a single pixel, every single time it's called. It does the same as set() just more long winded and ineffic
TAG : performance
Date : October 07 2020, 09:00 AM , By : Arun V Ramesh
How to correctly dockerize and continuously integrate 20GB raw data?
How to correctly dockerize and continuously integrate 20GB raw data?
it fixes the issue Huge mostly-static data blocks like this are probably the one big exception to me to the “Docker images should be self-contained” rule. I’d suggest keeping this data somewhere else, and download it separately from the core docker r
TAG : performance
Date : October 06 2020, 08:00 AM , By : Johnson Young
Will errorWithoutStackTrace be faster than error when there isn't HasCallStack?
Will errorWithoutStackTrace be faster than error when there isn't HasCallStack?
Hope this helps error means something bad happened so for most, if not all purposes, it does not matter how fast it is, because it indicates a program that's not working.
TAG : performance
Date : October 05 2020, 11:00 AM , By : hacker_new
Check permission; always a request against database?
Check permission; always a request against database?
seems to work fine I'd recommend using Shiro's filters to handle the actual login logic for you. https://shiro.apache.org/web.htmlOtherwise, you could end up with the Subject not tied to your Session. It looks like your application might be forcing a
TAG : performance
Date : October 05 2020, 12:00 AM , By : lol
Performance improvement jsf
Performance improvement jsf
it helps some times You hardly see a performance improvement because the author of this blog highly exagerates when he/she states:
TAG : performance
Date : October 04 2020, 11:00 PM , By : vaibhav mehta
Does the running of a second thread on an hyperthreaded CPU introduce extra overhead throughout the pipeline?
Does the running of a second thread on an hyperthreaded CPU introduce extra overhead throughout the pipeline?
This might help you Right, hyperthreading works by multiplexing the the instruction streams of each thread in the frontend stages and the retirement stage of the pipeline. In the RS and MOB units, uops from different threads can be dispatched to the
TAG : performance
Date : October 03 2020, 01:00 AM , By : Ammonbandi
Multiple MPI communications and performance
Multiple MPI communications and performance
like below fixes the issue You may assume that multiple calls will never be faster than a single call for the same total volume. The simple reason is that an MPI implementation could simply split up a single call into multiple calls internally if it
TAG : performance
Date : October 01 2020, 02:00 PM , By : moblee
What about type instability hurts peformance so much?
What about type instability hurts peformance so much?
I wish this help you A major factor is that type instabilities cause dynamic dispatch where the language needs to workout what method (for some function taking the type unstable variable) needs to be called at runtime. In the static case, this compil
TAG : performance
Date : October 01 2020, 09:00 AM , By : Arun Kalesh
Why select distinct partitioned column is very slow?
Why select distinct partitioned column is very slow?
fixed the issue. Will look into that further If you can use shell, then get partition list into variable using SHOW PARTITIONS (works fast) and transform it to the comma-separated list using AWK. Then parametrize your hive script using the variable w
TAG : performance
Date : September 29 2020, 07:00 PM , By : Sunil Varma
Do FP and integer division compete for the same throughput resources on x86 CPUs?
Do FP and integer division compete for the same throughput resources on x86 CPUs?
wish of those help Intel CPU architect Ronak Singhal mentions on Twitter that Broadwell (and by implication subsequent architectures until ICL) use the FP hardware for division, but that Ice Lake has a dedicated integer division unit:
TAG : performance
Date : September 29 2020, 02:00 PM , By : Simonell
What is FLOPS in field of deep learning?
What is FLOPS in field of deep learning?
around this issue What is FLOPS in field of deep learning? Why we don't use the term just FLO?
TAG : performance
Date : September 29 2020, 03:00 AM , By : MOTW HUNTER
Why does Vec::retain run slower after updating to Rust 1.38.0?
Why does Vec::retain run slower after updating to Rust 1.38.0?
I wish this helpful for you In general, rust.godbolt.org is useful for checking quality of the generated code (but don't forget to add optimization flags!)In your case code generated for retain has clearly changed for worse: https://rust.godbolt.org/
TAG : performance
Date : September 28 2020, 03:00 PM , By : 남연승
Slowdowns of performance of ets select
Slowdowns of performance of ets select
I hope this helps . match_spec, the 2nd argument of the select/2 is making it slower.According to an answer on this question
TAG : performance
Date : September 28 2020, 06:00 AM , By : Ree
How do I read the Network Tab in Chrome DevTools - Load Times
How do I read the Network Tab in Chrome DevTools - Load Times
this will help transferred means from the network, the rest (out of 758 kB total) was from the cache finish is the last resource's timestamp so it changes whenever a new request is made DOMContentLoaded is the timestamp of the DOMContentLoaded event:
TAG : performance
Date : September 27 2020, 07:00 PM , By : Jukka Zuvela
in Snowflake, Does resize an existing warehouse helps in improving the performance of a running query?
in Snowflake, Does resize an existing warehouse helps in improving the performance of a running query?
hope this fix your issue Resizing a running warehouse does not impact queries that are already being processed by the warehouse; the additional servers are only used for queued and new queries.https://docs.snowflake.net/manuals/user-guide/warehouses-
TAG : performance
Date : September 27 2020, 02:00 PM , By : Mitarohmar
Do single threaded programs execute in parallel in a CPU?
Do single threaded programs execute in parallel in a CPU?
wish of those help Yes, CPUs find instruction-level parallelism within a single thread to run more than 1 instruction per cycle. See Why does re-initializing a register inside an unrolled ADD loop make it run faster even with more instructions inside
TAG : performance
Date : September 26 2020, 07:00 PM , By : Nguyen Truong Pham
Chrome Web Requests getting stuck for 8 seconds
Chrome Web Requests getting stuck for 8 seconds
it fixes the issue There could be two issues as per your explanation and the screenshot you have posted here.
TAG : performance
Date : September 26 2020, 12:00 AM , By : Brendan French
Dynatrace: what is the meaning of srv in dtCookie Cookie set by UEM
Dynatrace: what is the meaning of srv in dtCookie Cookie set by UEM
I wish this helpful for you It's not related to the number of servers as I have seen the values higher than the number of servers. Something internal to DynaTrace and as you correctly said there is no documentation for this.
TAG : performance
Date : September 24 2020, 09:00 PM , By : yassine
Why does Raku perform so bad with multidimensional arrays?
Why does Raku perform so bad with multidimensional arrays?
like below fixes the issue An initial direct comparison I'll begin with code that is much more closely aligned with your Python code than your own translation. I think the Raku code that's most directly equivalent to your Python is:
TAG : performance
Date : September 24 2020, 06:00 PM , By : 0x7ebc42ff
Neo4j query taking long time
Neo4j query taking long time
I hope this helps . If you're trying to get a user's timeline, I would think you'd start with the specific user, then connect to other nodes via the relationships you're interested in. The current query isn't taking advantage of pattern matching or t
TAG : performance
Date : September 23 2020, 09:00 PM , By : Tânia Eiko
What causes this high variability in cycles for a simple tight loop with -O0 but not -O3, on a Cortex-A72?
What causes this high variability in cycles for a simple tight loop with -O0 but not -O3, on a Cortex-A72?
wish of those help In recent Linux kernels the automatic NUMA page migration mechanism periodically shoots down TLB entries so that it can monitor NUMA locality. TLB reloads will slow down the O0 code, even if the data remains in the L1DCache.The pag
TAG : performance
Date : September 22 2020, 03:00 PM , By : Rakesh Dash
Why is my SSE assembly slower in release builds?
Why is my SSE assembly slower in release builds?
fixed the issue. Will look into that further You're timing in reference cycles with rdtsc, not core clock cycles. It's probably the same speed both times, in core clock cycles, but with the CPU running at different frequencies.Probably a debug build
TAG : performance
Date : September 20 2020, 02:00 PM , By : Prince
From S3 to Snowflake and performance
From S3 to Snowflake and performance
To fix this issue Snowflake Has some documentation that should answer this pretty well here. In short: Ideally your files are big, but not so big and/or complicated that they take more than a minute to process.I have some snowpipes that handle a lot
TAG : performance
Date : September 16 2020, 04:00 AM , By : Not
Why these 2 similar queries in Snowflake have very different performance?
Why these 2 similar queries in Snowflake have very different performance?
I wish did fix the issue. in the second query you can see bytes spilled to local storage is 272gb. This means that the work done in processing was too large to fit in the cluster memory and so had to spill to local attached SSD. From a performance pe
TAG : performance
Date : August 20 2020, 12:56 PM , By : Aleks Gorbenko
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