marray | Fast Runtime-Flexible Multi | Performance Testing library
kandi X-RAY | marray Summary
kandi X-RAY | marray Summary
Marray: Fast Runtime-Flexible Multi-dimensional Arrays and Views in C++.
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marray Examples and Code Snippets
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Trending Discussions on marray
QUESTION
The following code maps the JSON file and displays a comma list of unique AREAID values and displays it in:
...ANSWER
Answered 2021-Mar-18 at 04:50For me, this api gives an error, so enter it manually
QUESTION
I'm using LeakCanary but the heap analysis result doesn't provide enough information to detect any leak. It only mentions that the activity is leaking.
...ANSWER
Answered 2021-Mar-14 at 22:08Does the activity register any broadcast receiver? The leaktrace shows LoadedApk.mReceivers which is an ArrayMap of receivers to receiver dispatcher and the activity is the receiver dispatcher.
QUESTION
I have tried to set adapter null in onDestroyView also tried with addOnAttachStateChangeListener but still there is memory leak.
Here is my Stack Trace
...ANSWER
Answered 2021-Feb-25 at 03:03TopicFragment is in a created state, Fragment.mAnimationInfo retains a Fragment$AnimationInfo and Fragment$AnimationInfo.mFocusedView retains the fragments detached view which should have been GCed.
This value is set by calls to Fragment.setFocusView(), and a quick search shows that's never ever cleared: https://cs.android.com/search?q=setFocusedView&sq=&ss=androidx%2Fplatform%2Fframeworks%2Fsupport
Looks like this change was introduced in 2020: https://cs.android.com/androidx/platform/frameworks/support/+/1052c3662c40176f7f02da9e06b989dcab21d500
The best would be to file an issue against the androidx fragments library.
Actually this was already filed, fixed in the next release: https://issuetracker.google.com/issues/179925887
QUESTION
I have Clang's -Wunused
flag set but its failing to detect an assigned (but unused) stack variable.
Below I create an instance of a typedef'd array on the stack, but never use it:
...ANSWER
Answered 2021-Jan-16 at 10:01const ATypedefdArray arr = marray;
will call copy constructor, and destructor will be called at end of scope.
if both are trivial, then clang/gcc succeed to detect unused variable Demo.
If any are non trivial, they might have side effects, and so are used. they might have expected side effect have some intentional RAII usage as std::lock_guard
, or unintentional as std::string
. so no warning Demo
QUESTION
I'm new at C. Here is a function, one of its' proposes is to fill the sizes, and I have problems with it. I fill it correctly, but then, in perform(), where I call marray_read() from, sizes is filled with zeros.
...ANSWER
Answered 2021-Jan-01 at 12:03You forgot to dereferce (*sizes)
:
QUESTION
I'm switching a program from using MVector Word32
to STUArray Word Word32
. In my vector code, I used unsafeMove
to move vector slices around; thinking it was probably wrapping memmove
for efficiency.
ANSWER
Answered 2020-Dec-25 at 18:53thinking it was probably wrapping memmove for efficiency
First I decided to check for you whether this is actually true, and it is.
unsafeMove
eventually boils down to thebasicUnsafeCopy
operation defined forMVector
, which delegates tocopyMutableArray
.copyMutableArray
's implementation varies by GHC version. For old versions, it was just an IO loop in ordinary Haskell, but since 7.8 it has delegated to a primopcopyMutableArray#
.copyMutableArray#
is a wrapper aroundmemmove
andmemcopy
, depending whether the arrays overlap.
I grepped through the source of Data.Array, and found no references to copyMutableArray
. Another possibility would be that Data.Array exposes some way for you to view your STUArray as a MutableArray, and thereby call copyMutableArray
yourself. But I also find no mention of MutableArray in Data.Array.
My tentative conclusion is that there is no memmove
/memcopy
wrapper in Data.Array.
QUESTION
I am currently attempting to implement a metaheuristic (genetic) algorithm. In this venture i also want to try and create somewhat fast and efficient code. However, my experience in creating efficient coding is not very great. I was therefore wondering if some people could give some "quick tips" to increase the efficiency of my code. I have created a small functional example of my code which contains most of the elements that the code will contain i regards to preallocating arrays, custom mutable structs, random numbers, pushing into arrays etc.
The options that I have already attempted to explore are options in regards to the package "StaticArrays". However many of my arrays must be mutable (so we need MArrays) and many of them will become very large > 100. The documentation of StaticArrays specify that the size of the StaticArrays package must remain small to remain efficient.
According to the documentation Julia 1.5.2 should be thread safe in regards to rand(). I have therefor attempted to multithread for-loops in my functions to make them run faster. And this results in a slight performance increase .
However if people can se a more efficient way of allocating Arrays or pushing in SpotPrices into an array it would be greatly appreciated! Any other performance tips are also very welcome!
...ANSWER
Answered 2020-Nov-15 at 15:27Have a look at read very carefully https://docs.julialang.org/en/v1/manual/performance-tips/
Basic cleanups start with:
- Your
SpotPrices
struct
does not need to me mutable. Anyway since there is only one field you could just define it asSpotPrices=Vector{Float64}
- You do not want untyped containers - instead of
prices = []
doprices = Float64[]
- Using
DataFrames.groupby
will be much faster than finding unique elements and filtering by them - If yo do not need initialze than do not do it
Vector{Float64}(undef, sample_size)
is much faster thanzeros(sample_size, 24)
- You do not need to synchronize
@sync
before a multi-threaded loop - Create a random states - one separate one for each thread and use them whenever calling the
rand
function
QUESTION
I'd like to store the pointers of two arrays (*a
and *b
) created by malloc
in a function.
For example, if &a[0]=0x0061FEC8
and &b[0]=0x007700FE
, then the array to store these two pointers should be c[0]=0x0061FEC8
and c[1]=0x007700FE
ANSWER
Answered 2020-Oct-31 at 06:05If an array is int *
then an array of arrays is int **
and if you want to return an array of arrays as an out parameter, then you need a pointer to that -- int ***
. So you need to change the type of mArray
as well as the ptrArray
parameter:
QUESTION
this is the code I wrote, and I have been getting the error.
What I am trying to do is that Client have 2 child classes "CASUAL_JOB and CONTRACT_JOB" but these 2 classes have Client No (primary key of Client Table) under different Heading. So my target is to find total cost (info in Invoice Table) which is integrated with JobID (present in Invoice, Contract_Job, Contract_job Tables) and retrieve Client Info from Client Table
(+) is for left Outer Joint
...ANSWER
Answered 2020-Oct-11 at 11:00I formatted your code so it's readable. And by indenting it, you can see where the problem is. It's in line 6/7 in the "FROM" part. Oracle can't really figure out what you're trying to do with that statement and when the parser reaches the end of the query at "(+)", he tells you that there is something missing/awkward. That's why he tells you it's the "(+)". But the problem is earlier. It's the way your build your "FROM" part. It's a bit confusing, so here is just a pointers:
when using "union", you don't give an alias to each of the two queries. The result set of both queries is "unioned", so you can't reference either of them in the "WHERE" part.
You should rewrite your query and instead of joining Client with a Union, you should Union two separate queries: one joining Client with casual_jobs, one joining Client with contrac_job. Following example is done without testing it in an SQL tool:
QUESTION
newbie JavaScript question.
This function is supposed to make a route cipher out of a given string.
Why is this resulting in an infinite loop?
...ANSWER
Answered 2020-Sep-07 at 21:31I think j+columns
should be j+=columns
. The equal sign is missing.
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