multithreading

问题 Describtion To implement multithreading in hibernate & jpa, i deep copy some of my entities. Those copys are used by the sessions to add, remove or update the entities. Problem It worked fine so far, but i ran into a issue with parent/child relations. When i update my parent, its childs are "always" inserted... they never receive any sort of update. And this is pretty bad, because i receive a "Duplicate Key" exception at the second parent-update iteration. My flow currently looks like the

问题 Describtion To implement multithreading in hibernate & jpa, i deep copy some of my entities. Those copys are used by the sessions to add, remove or update the entities. Problem It worked fine so far, but i ran into a issue with parent/child relations. When i update my parent, its childs are "always" inserted... they never receive any sort of update. And this is pretty bad, because i receive a "Duplicate Key" exception at the second parent-update iteration. My flow currently looks like the

问题 Describtion To implement multithreading in hibernate & jpa, i deep copy some of my entities. Those copys are used by the sessions to add, remove or update the entities. Problem It worked fine so far, but i ran into a issue with parent/child relations. When i update my parent, its childs are "always" inserted... they never receive any sort of update. And this is pretty bad, because i receive a "Duplicate Key" exception at the second parent-update iteration. My flow currently looks like the

问题 To improve my code which has one heavy loop I need a speed up. How can I implement multiprocessing for a code like this? (a is typical of size 2 and l up to 10) for x1 in range(a**l): for x2 in range(a**l): for x3 in range(a**l): output[x1,x2,x3] = HeavyComputationThatIsThreadSafe1(x1,x2,x3) 回答1: If the HeavyComputationThatIsThreadSafe1 function only uses arrays and not python objects, I would using a concurrent futures (or the python2 backport) ThreadPoolExecutor along with Numba (or cython)

问题 We are evaluating GroovyShell interpreter (v2.4) in our application for dynamically executing standard Java syntax. Earlier, we were using Java BeanShell Interpreter for it, but it has an issue under high load which prompted us to look for an alternative such as Groovy. Sample Java Code static String script = "int y = x * x; System.out.println(\"** value of y ** :: \" + y ); "; GroovyShell gs = new GroovyShell(); Script evalScript = gs.parse("void evalMethod() {" + script + "}"); // bind

问题 We are evaluating GroovyShell interpreter (v2.4) in our application for dynamically executing standard Java syntax. Earlier, we were using Java BeanShell Interpreter for it, but it has an issue under high load which prompted us to look for an alternative such as Groovy. Sample Java Code static String script = "int y = x * x; System.out.println(\"** value of y ** :: \" + y ); "; GroovyShell gs = new GroovyShell(); Script evalScript = gs.parse("void evalMethod() {" + script + "}"); // bind

问题 I was debugging a multithreaded application that is using std::thread to run a function. I reach to the following code when debugging. extern "C" uintptr_t __cdecl _beginthreadex( void* const security_descriptor, unsigned int const stack_size, _beginthreadex_proc_type const procedure, void* const context, unsigned int const creation_flags, unsigned int* const thread_id_result ) { _VALIDATE_RETURN(procedure != nullptr, EINVAL, 0); unique_thread_parameter parameter(create_thread_parameter

问题 When I am trying to start Cassandra it shows me error like this I already did changes in the conf file also in env.sh, the file also. No options of similar type error is working for this. intx ThreadPriorityPolicy=42 is outside the allowed range [ 0 ... 1 ] Improperly specified VM option 'ThreadPriorityPolicy=42' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. Other Information java version "9.0.4" Java(TM) SE Runtime Environment

问题 When I am trying to start Cassandra it shows me error like this I already did changes in the conf file also in env.sh, the file also. No options of similar type error is working for this. intx ThreadPriorityPolicy=42 is outside the allowed range [ 0 ... 1 ] Improperly specified VM option 'ThreadPriorityPolicy=42' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. Other Information java version "9.0.4" Java(TM) SE Runtime Environment

问题 When I am trying to start Cassandra it shows me error like this I already did changes in the conf file also in env.sh, the file also. No options of similar type error is working for this. intx ThreadPriorityPolicy=42 is outside the allowed range [ 0 ... 1 ] Improperly specified VM option 'ThreadPriorityPolicy=42' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. Other Information java version "9.0.4" Java(TM) SE Runtime Environment