Hi, Virtual threads only shine on I/O bound tasks, in terms of throughput (not latency). They were created for that, don't expect any improvement on CPU bound tasks.
Regards, Joan. -----Original Message----- From: Owner <o8076...@gmail.com> Sent: Tuesday, January 21, 2025 11:32 AM To: Tomcat Users List <users@tomcat.apache.org> Subject: Re: Tomcat Virtual Threads Performance Hi Maxim, https://postimg.cc/N9n8CQW7 there you go! Do let me know if it's not up :) Regards Andy On Tue, Jan 21, 2025 at 6:30 PM Maxim Solodovnik <solomax...@gmail.com> wrote: > your image was dropped :(( > please use some image image service and provide the URL here :)) > > On Tue, 21 Jan 2025 at 16:40, Owner <o8076...@gmail.com> wrote: > > > Hey Tomcat, > > > > Andy here. I'm not sure if this is the place to ask this question, > > but I wanted to check regarding performances of virtual threads vs > > using a conventional worker thread pool. > > > > I set up an endpoint with a CPU task of calculating factorials like > > the > > below: > > > > @GetMapping("/fullCPU") > > public void allCPU() throws InterruptedException { > > factorialCalculator(); > > } > > > > public void factorialCalculator() { > > int numberOfOperations = 35; > > BigInteger factorial = BigInteger.ONE; > > int n = 4000; > > for (int i = 1; i <= numberOfOperations; i++) { > > for (int j = 1; j <= n; j++) { > > factorial = factorial.multiply(BigInteger.valueOf(j)); > > } > > factorial = BigInteger.ONE; > > } > > > > When enabling virtual threads (using spring.virtual.threads.enabled > > with Tomcat 10.1.33), the results I get are as follows. I utilise > > JMeter to do stress testing - > > [image: image.png] > > Is there a reason why for CPU tasks, the performance for virtual > > threads is so much worse? Theoretically both virtual threads and > > platform threads should take the same amount of CPU time right? > > > > Thank you! > > > > Regards, > > Andy > > > > > -- > Best regards, > Maxim > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
