PERFORMANCE: There is absolutely no performance difference in where the try/catch structures are placed. Internally, they are implemented as a code-range table in a structure that is created when the method is called. While the method is executing, the try/catch structures are completely out of the picture unless a throw occurs, then the location of … Read more
I needed to know this for sure, so I benchmarked both methods. I consistenly found IN to be much faster than using OR. Do not believe people who give their “opinion”, science is all about testing and evidence. I ran a loop of 1000x the equivalent queries (for consistency, I used sql_no_cache): IN: 2.34969592094s OR: … Read more
Let’s start with the uncomfortable truth: GWT compiler performance is really lousy. You can use some hacks here and there, but you’re not going to get significantly better performance. A nice performance hack you can do is to compile for only specific browsers, by inserting the following line in your gwt.xml: <define-property name=”user.agent” values=”ie6,gecko,gecko1_8″></define-property> or … Read more
Numbers everyone should know 0.5 ns – CPU L1 dCACHE reference 1 ns – speed-of-light (a photon) travel a 1 ft (30.5cm) distance 5 ns – CPU L1 iCACHE Branch mispredict 7 ns – CPU L2 CACHE reference 71 ns – CPU cross-QPI/NUMA best case on XEON E5-46* 100 ns – MUTEX lock/unlock 100 ns … Read more
Not answering the specifics of your question so much as the title: the 2006 Technical Report on C++ Performance has an interesting section on IOStreams (p.68). Most relevant to your question is in Section 6.1.2 (“Execution Speed”): Since certain aspects of IOStreams processing are distributed over multiple facets, it appears that the Standard mandates an … Read more
Well, at the risk of making things too easy… for (var member in myObject) delete myObject[member]; …would seem to be pretty effective in cleaning the object in one line of code with a minimum of scary brackets. All members will be truly deleted instead of left as garbage. Obviously if you want to delete the … Read more
Starting with Chrome 38 you can do this without any plugins. Just click inspect element (or F12 hotkey), then click on “toggle device mod” and you will see something like this: Among many other features it allows you to simulate specific internet connection (3G, GPRS) P.S. for people who try to limit the upload speed. … Read more
The original answer discussing the code can be found below. First of all, you have to distinguish between different types of API, each with its own performance considerations. RDD API (pure Python structures with JVM based orchestration) This is the component which will be most affected by the performance of the Python code and the … Read more
There’s no fast way to retrieve attributes. But code ought to look like this (credit to Aaronaught): var t = typeof(YourClass); var pi = t.GetProperty(“Id”); var hasIsIdentity = Attribute.IsDefined(pi, typeof(IsIdentity)); If you need to retrieve attribute properties then var t = typeof(YourClass); var pi = t.GetProperty(“Id”); var attr = (IsIdentity[])pi.GetCustomAttributes(typeof(IsIdentity), false); if (attr.Length > 0) … Read more
This is not exactly showing you which rows are locked, but this may helpful to you. You can check which statements are blocked by running this: select cmd,* from sys.sysprocesses where blocked > 0 It will also tell you what each block is waiting on. So you can trace that all the way up to … Read more