John McCalpin

FEBRUARY 17, 2025

“Latency” is the duration from the execution of a load instruction (to an address that misses in all the caches), and the completion of that load instruction when the data is returned from memory. The example below is for a 2005-era processor with 60 ns memory latency and 6.4 cache lines -> 5.6

Latency 71

Latency Hardware Cache Systems 71

John McCalpin

FEBRUARY 17, 2025

“Latency” is the duration from the execution of a load instruction (to an address that misses in all the caches), and the completion of that load instruction when the data is returned from memory. The example below is for a 2005-era processor with 60 ns memory latency and 6.4 cache lines -> 5.6

Latency 40

Latency Hardware Cache Systems 40

SQL Performance

FEBRUARY 22, 2021

The system table sys.sysprocesses was replaced way back in SQL Server 2005 by a set of dynamic management views (DMVs), most notably sys.dm_exec_requests , sys.dm_exec_sessions , and sys.dm_exec_connections. Recently one of our teams was investigating a log reader latency issue.

Latency 57

Latency Servers Monitoring Systems 57

John McCalpin

APRIL 2, 2020

The presentation discusses a family of simple performance models that I developed over the last 20 years — originally in support of processor and system design at SGI (1996-1999), IBM (1999-2005), and AMD (2006-2008), but more recently in support of system procurements at The Texas Advanced Computing Center (TACC) (2009-present).

Benchmarking 59

Benchmarking Performance Latency Architecture 59

John McCalpin

APRIL 2, 2020

The presentation discusses a family of simple performance models that I developed over the last 20 years — originally in support of processor and system design at SGI (1996-1999), IBM (1999-2005), and AMD (2006-2008), but more recently in support of system procurements at The Texas Advanced Computing Center (TACC) (2009-present).

Benchmarking 40

Benchmarking Performance Latency Architecture 40

IO River

NOVEMBER 2, 2023

For example, Akamai introduced ASI in 2005, which became the standard for building new websites. Specialized featuresSome vendors offer specialized features that are not available in competing CDNs. These companies often utilize CDNs optimized for low-latency content delivery of the products that they offer.

Lambda 52

Lambda AWS Cache Website 52

IO River

NOVEMBER 2, 2023

So, when businesses integrate these exclusive features into their applications, they become tied to the vendor, as replicating these features in another CDN is impossible.‍For example, Akamai introduced ASI in 2005, which became the standard for building new websites. Akamai tried to convince many users to use this new framework.

Lambda 40

Lambda AWS Cache Website 40