FYI - I found that if I set RESOLVER_PROC=DEFAULT and use the default z/OS UNIX resolver, that the resolver startup time for a process dropped from 575 to 330ms. Its still not 2ms like on other systems I've tested, but it did move the needle.
On Thu, Jan 24, 2019 at 7:44 AM Kirk Wolf <k...@wolf-associates.com> wrote: > Mike, > > 1) Is there a DNS lookup for getaddrinfo(127.0.0.1) ? I wouldn't think > so. > > 2) From the trace, the time is lost *before* the getaddrinfo() call > starts. > > It happens here: > *Resolver Trace Initialization Complete -> 2019/01/23 10:30:10.433856 * > > (G) LookUp = DNS LOCAL > > (*) Cache > > (*) NoCacheReorder > > res_init Succeeded > > *res_init Started: 2019/01/23 10:30:10.973607 * > > Is this time used to look in the catalog for user-specific resolver data > sets? > I don't have any of these. > > On Thu, Jan 24, 2019 at 5:14 AM Mike Wawiorko < > 0000014ab5cdfb21-dmarc-requ...@listserv.ua.edu> wrote: > >> I would expect a difference for the first lookup for an IP address or >> name that needs to go to DNS (or your LOCAL files) versus a second or >> subsequent lookup that finds the necessary information in the resolver >> cache. >> >> Does this explain your experiences? >> >> Try displaying the resolver cache. >> >> Mike Wawiorko >> >> This e-mail and any attachments are confidential and intended solely for >> the addressee and may also be privileged or exempt from disclosure under >> applicable law. If you are not the addressee, or have received this e-mail >> in error, please notify the sender immediately, delete it from your system >> and do not copy, disclose or otherwise act upon any part of this e-mail or >> its attachments. >> Internet communications are not guaranteed to be secure or virus-free. >> The Barclays Group does not accept responsibility for any loss arising from >> unauthorised access to, or interference with, any Internet communications >> by any third party, or from the transmission of any viruses. Replies to >> this e-mail may be monitored by the Barclays Group for operational or >> business reasons. >> Any opinion or other information in this e-mail or its attachments that >> does not relate to the business of the Barclays Group is personal to the >> sender and is not given or endorsed by the Barclays Group. >> Barclays Services Limited provides support and administrative services >> across Barclays group. Barclays Services Limited is an appointed >> representative of Barclays Bank UK plc, Barclays Bank plc and Clydesdale >> Financial Services Limited. Barclays Bank UK plc and Barclays Bank plc are >> authorised by the Prudential Regulation Authority and regulated by the >> Financial Conduct Authority and the Prudential Regulation Authority. >> Clydesdale Financial Services Limited is authorised and regulated by the >> Financial Conduct Authority. >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >> > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
