prefetch

Reading really big blobs without downloading them in Google Cloud (streaming?)

由 亡梦爱人 提交于 2019-12-10 23:17:40
问题 please help! [+] What I have: A lot of blobs in every bucket. Blobs can vary in size from being less than a Kilo-byte to being lots of Giga-bytes. [+] What I'm trying to do: I need to be able to either stream the data in those blobs (like a buffer of size 1024 or something like that) or read them by chunks of a certain size in Python. The point is I don't think I can just do a bucket.get_blob() because if the blob was a TeraByte then I wouldn't be able to have it in physical memory. [+] What

typeahead.js prefetch doesn't work

由 烈酒焚心 提交于 2019-12-10 20:03:04
问题 I can't get the prefetch function in typeahead.js to work, it works just fine with the local data though. I first tried linking to a servlet returning json objects or lists, but after a while I gave up on that and started checking the provided examples. So their examples links to pages that look like this: http://twitter.github.io/typeahead.js/data/countries.json However, my script doesn't even work when I link it to that page even if I do exactly the same thing as they do. I tried copying

Difference between prefetch for read or write

由 雨燕双飞 提交于 2019-12-10 15:22:55
问题 The gcc docs talk about a difference between prefetch for read and prefetch for write. What is the technical difference? 回答1: On the CPU level, a software prefetch (as opposed to ones trigger by the hardware itself) are a convenient way to hint to the CPU that a line is about to be accessed, and you want it prefetched in advance to save the latency. If the access will be a simple read, you would want a regular prefetch, which would behave similarly to a normal load from memory (aside from not

IOS Rxswift use Kingfisher to prefetch cell Image

由 五迷三道 提交于 2019-12-08 07:37:53
问题 I'm trying to implement Kingfisher prefetch feature inside an Rxswift project. The problem is with these 2 function collectionView.rx.prefetchItems collectionView.rx.cancelPrefetchingForItems The instruction at Kingfisher github is quite short override func viewDidLoad() { super.viewDidLoad() collectionView?.prefetchDataSource = self } extension ViewController: UICollectionViewDataSourcePrefetching { func collectionView(_ collectionView: UICollectionView, prefetchItemsAt indexPaths:

IOS Rxswift use Kingfisher to prefetch cell Image

由 99封情书 提交于 2019-12-08 07:26:33
I'm trying to implement Kingfisher prefetch feature inside an Rxswift project. The problem is with these 2 function collectionView.rx.prefetchItems collectionView.rx.cancelPrefetchingForItems The instruction at Kingfisher github is quite short override func viewDidLoad() { super.viewDidLoad() collectionView?.prefetchDataSource = self } extension ViewController: UICollectionViewDataSourcePrefetching { func collectionView(_ collectionView: UICollectionView, prefetchItemsAt indexPaths: [IndexPath]) { let urls = indexPaths.flatMap { URL(string: $0.urlString) } ImagePrefetcher(urls: urls).start() }

Prefetching data in with Linq-to-SQL, IOC and Repository pattern

由 大兔子大兔子 提交于 2019-12-07 15:28:31
问题 using Linq-to-SQL I'd like to prefetch some data. 1) the common solution is to deal with DataLoadOptions , but in my architecture it won't work because : the options have to be set before the first query I'm using IOC, so I don't directly instanciate the DataContext (I cannot execute code at instanciation) my DataContext is persistent for the duration of a web request 2) I have seen another possibility based on loading the data and its childs in a method, then returning only the data (so the

How to determine SSE prefetch instruction size?

由 杀马特。学长 韩版系。学妹 提交于 2019-12-07 13:30:38
问题 I am working with code which contains inline assembly for SSE prefetch instructions. A preprocessor constant determines whether the instructions for 32-, 64- or 128-bye prefetches are used. The application is used on a wide variety of platforms, and so far I have had to investigate in each case which is the best option for the given CPU. I understand that this is the cache line size. Is this information obtainable automatically? It doesn't seem to be explicitly present in /proc/cpuinfo. 回答1:

Oracle JDBC prefetch: how to avoid running out of RAM

由 牧云@^-^@ 提交于 2019-12-07 06:47:55
问题 Using Oracle java JDBC (ojdbc14 10.2.x), loading a query with many rows takes forever (high latency environment. This is apparently the default prefetch in Oracle JDBC is default size "10" which requires a round trip time once per 10 rows. I am attempting to set an aggressive prefetch size to avoid this. PreparedStatement stmt = conn.prepareStatement("select * from tablename"); statement.setFetchSize(10000); ResultSet rs = statement.executeQuery(); This can work, but instead I get an out of

Scenarios when software prefetching manual instructions are reasonable

由 独自空忆成欢 提交于 2019-12-06 07:29:16
问题 I have read about that on x86 and x86-64 Intel gcc provides special prefetching instructions: #include <xmmintrin.h> enum _mm_hint { _MM_HINT_T0 = 3, _MM_HINT_T1 = 2, _MM_HINT_T2 = 1, _MM_HINT_NTA = 0 }; void _mm_prefetch(void *p, enum _mm_hint h); Programs can use the _mm_prefetch intrinsic on any pointer in the program. And The different hints to be used with the _mm_prefetch intrinsic are implementation defined. Generally said is that each of the hints have its own meaning. _MM_HINT_T0

programmatically disable hardware prefetching on AMD systems

由 冷暖自知 提交于 2019-12-06 02:49:24
问题 is there a way to programmatically disable the hardware prefetcher on an AMD system like you can in an Intel system as discussed in this topic Specifically for the AMD Opteron Barcelona or Istanbul architecture. 回答1: All AMD Family 10h processors (including Barcelona and Istanbul) have two different hardware prefetchers. The first is the traditional data cache prefetcher that recognizes contiguous streams of either ascending or descending cache line accesses. It can be disabled by setting bit
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