Re: Reg: caching allowed setting in tomcat
Mark and Jalaj, On 3/3/21 02:59, Mark Thomas wrote: On 02/03/2021 16:55, Jalaj Asher wrote: --- Just to clarify when I disable cachingallowed setting does it stop the compilation in the tomcat i.e the files I see in the work folder, because I still see the compiled files there. Wanted to know if it will force recompiles on each access . No. It does not force a recompile on each access. JSPs need to be read completely twice during the compilation phase. In memory caching improves the performance of the second read. How noticeable this is will depend on your application and the host where Tomcat is running. I would argue that a production site shouldn't be getting much in the way of changes to JSPs and therefore the caching for JSP sources shouldn't really matter at all. --- Can you share some insight on the OS level caching ? Primarily where would OS be caching it ? I'd expect there to be some form of read cache for disk access. The split between OS and hardware will be system dependent. Any decent OS will use all available memory for disk caching. Using the Java heap for caching just adds a layer of priority in favor of your application's resources. -chris -Original Message- From: Mark Thomas Sent: Tuesday, March 2, 2021 2:50 AM To: users@tomcat.apache.org Subject: Re: Reg: caching allowed setting in tomcat Attention: This email was sent from someone outside of eClinicalWorks. Always use caution when opening attachments or clicking links from unknown senders or when receiving unexpected emails. On 01/03/2021 16:03, Jalaj Asher wrote: I see that the cachingallowed setting is primarily for static content caching. But considering my application we have a lot of static content data resulting in almost 100 to 150 MB of heap memory being used because of this caching. 1. Is there any way to do this caching on disk ? What would be the point of that? That static content is already on disk. It is being cached in memory to improve performance. 1. My static content is being cached in the browser on client end . any negative repercussions that I should be aware off if I disable caching on the tomcat end ? for eg will it impact jsp compilations on the tomcat ? I assume not as they are not static but wanted to confirm. JSP source is static content. Disabling caching may impact JSP compilation time but OS level caching may mitigate that. There many variables that impact performance. The only way to get true sense of the impact is to measure performance with caching enabled and disabled and compare the two. Generally, deploying your application as a WAR file with unpackWARs="false" has the biggest negative impact on performance. If you deploy with unpackWARs="true" or as a directory then I suspect the difference will be minimal. Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential information belonging to the sender that is legally privileged and proprietary and may be subject to protection under the law, including the Health Insurance Portability and Accountability Act (HIPAA). If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you. CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential information belonging to the sender that is legally privileged and proprietary and may be subject to protection under the law, including the Health Insurance Portability and Accountability Act (HIPAA). If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Reg: caching allowed setting in tomcat
Thank you mark for the response it helps. Regards Jalaj P Asher -Original Message- From: Mark Thomas Sent: Wednesday, March 3, 2021 2:59 AM To: users@tomcat.apache.org Subject: Re: Reg: caching allowed setting in tomcat Attention: This email was sent from someone outside of eClinicalWorks. Always use caution when opening attachments or clicking links from unknown senders or when receiving unexpected emails. On 02/03/2021 16:55, Jalaj Asher wrote: > --- Just to clarify when I disable cachingallowed setting does it stop > the compilation in the tomcat i.e the files I see in the work folder, because > I still see the compiled files there. Wanted to know if it will force > recompiles on each access . No. It does not force a recompile on each access. JSPs need to be read completely twice during the compilation phase. In memory caching improves the performance of the second read. How noticeable this is will depend on your application and the host where Tomcat is running. > --- Can you share some insight on the OS level caching ? Primarily where > would OS be caching it ? I'd expect there to be some form of read cache for disk access. The split between OS and hardware will be system dependent. Mark > > Regards > > Jalaj > > > -Original Message- > From: Mark Thomas > Sent: Tuesday, March 2, 2021 2:50 AM > To: users@tomcat.apache.org > Subject: Re: Reg: caching allowed setting in tomcat > > Attention: This email was sent from someone outside of eClinicalWorks. Always > use caution when opening attachments or clicking links from unknown senders > or when receiving unexpected emails. > > On 01/03/2021 16:03, Jalaj Asher wrote: >> I see that the cachingallowed setting is primarily for static content >> caching. >> >> But considering my application we have a lot of static content data >> resulting in almost 100 to 150 MB of heap memory being used because of this >> caching. >> >> >> 1. Is there any way to do this caching on disk ? > > What would be the point of that? That static content is already on disk. > It is being cached in memory to improve performance. > >> 1. My static content is being cached in the browser on client end . any >> negative repercussions that I should be aware off if I disable caching on >> the tomcat end ? for eg will it impact jsp compilations on the tomcat ? I >> assume not as they are not static but wanted to confirm. > > JSP source is static content. Disabling caching may impact JSP compilation > time but OS level caching may mitigate that. There many variables that impact > performance. The only way to get true sense of the impact is to measure > performance with caching enabled and disabled and compare the two. > > Generally, deploying your application as a WAR file with unpackWARs="false" > has the biggest negative impact on performance. If you deploy with > unpackWARs="true" or as a directory then I suspect the difference will be > minimal. > > Mark > > - > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > > CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential > information belonging to the sender that is legally privileged and > proprietary and may be subject to protection under the law, including the > Health Insurance Portability and Accountability Act (HIPAA). If you are not > the intended recipient of this e-mail, you are prohibited from sharing, > copying, or otherwise using or disclosing its contents. If you have received > this e-mail in error, please notify the sender immediately by reply e-mail > and permanently delete this e-mail and any attachments without reading, > forwarding or saving them. Thank you. > > CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential > information belonging to the sender that is legally privileged and > proprietary and may be subject to protection under the law, including the > Health Insurance Portability and Accountability Act (HIPAA). If you are not > the intended recipient of this e-mail, you are prohibited from sharing, > copying, or otherwise using or disclosing its contents. If you have received > this e-mail in error, please notify the sender immediately by reply e-mail > and permanently delete this e-mail and any attachments without reading, > forwarding or saving them. Thank you. > > - > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tom
Re: Reg: caching allowed setting in tomcat
On 02/03/2021 16:55, Jalaj Asher wrote: --- Just to clarify when I disable cachingallowed setting does it stop the compilation in the tomcat i.e the files I see in the work folder, because I still see the compiled files there. Wanted to know if it will force recompiles on each access . No. It does not force a recompile on each access. JSPs need to be read completely twice during the compilation phase. In memory caching improves the performance of the second read. How noticeable this is will depend on your application and the host where Tomcat is running. --- Can you share some insight on the OS level caching ? Primarily where would OS be caching it ? I'd expect there to be some form of read cache for disk access. The split between OS and hardware will be system dependent. Mark Regards Jalaj -Original Message- From: Mark Thomas Sent: Tuesday, March 2, 2021 2:50 AM To: users@tomcat.apache.org Subject: Re: Reg: caching allowed setting in tomcat Attention: This email was sent from someone outside of eClinicalWorks. Always use caution when opening attachments or clicking links from unknown senders or when receiving unexpected emails. On 01/03/2021 16:03, Jalaj Asher wrote: I see that the cachingallowed setting is primarily for static content caching. But considering my application we have a lot of static content data resulting in almost 100 to 150 MB of heap memory being used because of this caching. 1. Is there any way to do this caching on disk ? What would be the point of that? That static content is already on disk. It is being cached in memory to improve performance. 1. My static content is being cached in the browser on client end . any negative repercussions that I should be aware off if I disable caching on the tomcat end ? for eg will it impact jsp compilations on the tomcat ? I assume not as they are not static but wanted to confirm. JSP source is static content. Disabling caching may impact JSP compilation time but OS level caching may mitigate that. There many variables that impact performance. The only way to get true sense of the impact is to measure performance with caching enabled and disabled and compare the two. Generally, deploying your application as a WAR file with unpackWARs="false" has the biggest negative impact on performance. If you deploy with unpackWARs="true" or as a directory then I suspect the difference will be minimal. Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential information belonging to the sender that is legally privileged and proprietary and may be subject to protection under the law, including the Health Insurance Portability and Accountability Act (HIPAA). If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you. CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential information belonging to the sender that is legally privileged and proprietary and may be subject to protection under the law, including the Health Insurance Portability and Accountability Act (HIPAA). If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Reg: caching allowed setting in tomcat
Thanks for the response Mark. JSP source is static content. Disabling caching may impact JSP compilation time but OS level caching may mitigate that. There many variables that impact performance. The only way to get true sense of the impact is to measure performance with caching enabled and disabled and compare the two. --- Just to clarify when I disable cachingallowed setting does it stop the compilation in the tomcat i.e the files I see in the work folder, because I still see the compiled files there. Wanted to know if it will force recompiles on each access . --- Can you share some insight on the OS level caching ? Primarily where would OS be caching it ? Regards Jalaj -Original Message- From: Mark Thomas Sent: Tuesday, March 2, 2021 2:50 AM To: users@tomcat.apache.org Subject: Re: Reg: caching allowed setting in tomcat Attention: This email was sent from someone outside of eClinicalWorks. Always use caution when opening attachments or clicking links from unknown senders or when receiving unexpected emails. On 01/03/2021 16:03, Jalaj Asher wrote: > I see that the cachingallowed setting is primarily for static content caching. > > But considering my application we have a lot of static content data resulting > in almost 100 to 150 MB of heap memory being used because of this caching. > > >1. Is there any way to do this caching on disk ? What would be the point of that? That static content is already on disk. It is being cached in memory to improve performance. >1. My static content is being cached in the browser on client end . any > negative repercussions that I should be aware off if I disable caching on the > tomcat end ? for eg will it impact jsp compilations on the tomcat ? I assume > not as they are not static but wanted to confirm. JSP source is static content. Disabling caching may impact JSP compilation time but OS level caching may mitigate that. There many variables that impact performance. The only way to get true sense of the impact is to measure performance with caching enabled and disabled and compare the two. Generally, deploying your application as a WAR file with unpackWARs="false" has the biggest negative impact on performance. If you deploy with unpackWARs="true" or as a directory then I suspect the difference will be minimal. Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential information belonging to the sender that is legally privileged and proprietary and may be subject to protection under the law, including the Health Insurance Portability and Accountability Act (HIPAA). If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you. CONFIDENTIALITY NOTICE TO RECIPIENT: This transmission contains confidential information belonging to the sender that is legally privileged and proprietary and may be subject to protection under the law, including the Health Insurance Portability and Accountability Act (HIPAA). If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Reg: caching allowed setting in tomcat
On 01/03/2021 16:03, Jalaj Asher wrote: I see that the cachingallowed setting is primarily for static content caching. But considering my application we have a lot of static content data resulting in almost 100 to 150 MB of heap memory being used because of this caching. 1. Is there any way to do this caching on disk ? What would be the point of that? That static content is already on disk. It is being cached in memory to improve performance. 1. My static content is being cached in the browser on client end . any negative repercussions that I should be aware off if I disable caching on the tomcat end ? for eg will it impact jsp compilations on the tomcat ? I assume not as they are not static but wanted to confirm. JSP source is static content. Disabling caching may impact JSP compilation time but OS level caching may mitigate that. There many variables that impact performance. The only way to get true sense of the impact is to measure performance with caching enabled and disabled and compare the two. Generally, deploying your application as a WAR file with unpackWARs="false" has the biggest negative impact on performance. If you deploy with unpackWARs="true" or as a directory then I suspect the difference will be minimal. Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
