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New Ways to Find Latency in Linux Using Tracing - P99 CONF 2021
https://www.p99conf.io/session/new-ways-to-find-latency-in-linux-using-tracing/
New Ways to Find Latency in Linux Using Tracing. Ftrace is the official tracer of the Linux kernel. It originated from the real-time patch (now known as PREEMPT_RT), as developing an operating system for real-time use requires deep insight and transparency of the happenings of the kernel. Not only was tracing useful for debugging, but it was critical for finding areas in the kernel that …
3.10. Latency Tracing Using trace-cmd Red Hat …
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/7/html/tuning_guide/latency_tracing_using_trace-cmd
Latency Tracing Using trace-cmd trace-cmd is a front-end tool to ftrace. It can enable the ftrace interactions described earlier without needing to write into the /sys/kernel/debug/tracing/ directory. It can be installed without the special tracing kernel variants, and it does not add any overhead when it is installed.
Linux Low-Latency Tracing for Multicore Hard Real-Time …
https://www.hindawi.com/journals/aceng/2015/261094/
Linux Low-Latency Tracing for Multicore Hard Real-Time Systems 1. Introduction. Tracing is a method to study the runtime behavior of a program’s execution. It consists in recording... 2. Related Work. This section presents the related work in the two main areas relevant for this paper, real-time ...
Linux bcc ext4 Latency Tracing - Brendan Gregg
https://brendangregg.com/blog/2016-10-06/linux-bcc-ext4dist-ext4slower.html
ext4dist is a bcc tool that uses kernel dynamic tracing (via kprobes) with BPF. bcc is a front-end and a collection of tools that use new Linux enhanced BPF tracing capabilities. I also wrote ext4slower, to trace these ext4 operations that …
3.9. Using the ftrace Utility for Tracing Latencies - Red Hat
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/7/html/tuning_guide/using_the_ftrace_utility_for_tracing_latencies
Using the ftrace Utility for Tracing Latencies One of the diagnostic facilities provided with the Red Hat Enterprise Linux for Real Time kernel is ftrace, which is used by developers to analyze and debug latency and performance issues that occur outside of user-space.
Tracing the Linux kernel with ftrace - #embeddedbits
https://embeddedbits.org/tracing-the-linux-kernel-with-ftrace/
Ftrace is a tracing framework for the Linux kernel. It was added to the kernel back in 2008 and has evolved a lot since then. Ftrace stands for function tracer and basically lets you watch and record the execution flow of kernel functions.
Linux tracing and debugging - OSADL
https://www.osadl.org/fileadmin/dam/presentations/HOT-04-2020/HOT-2020-04-Technical-Session-2a-Linux-kernel-debug-and-trace-interface.pdf
Today, the term “ftrace” is history, a better word is „tracing“ or „kernel tracing“. It includes a variety of method that are used to understand kernel failures and help fixing them. The important common functionality is a FIFO that is optimized for speed and combines all tracing messages into a single data stream.
Tracing HTTP Request Latency in Go with OpenTracing
https://www.linux.com/news/tracing-http-request-latency-go-opentracing/
Tracing HTTP Request Latency in Go with OpenTracing. In Go 1.7 we have a new package net/http/httptrace that provides a convenient mechanism for observing what happens during an HTTP request. In this article I will show how it can be used in the context of distributed tracing, by using OpenTracing API to instrument a client and a server and ...
Hardware Latency Detector — The Linux Kernel …
https://docs.kernel.org/trace/hwlat_detector.html
The tracer hwlat_detector is a special purpose tracer that is used to detect large system latencies induced by the behavior of certain underlying hardware or firmware, independent of Linux itself. The code was developed originally to detect SMIs (System Management Interrupts) on x86 systems, however there is nothing x86 specific about this patchset.
5 system tools to monitor network traffic in Linux with …
https://www.golinuxcloud.com/linux-monitor-network-traffic/
qperf is a network bandwidth and latency measurement tool which works over many transports including TCP/IP, RDMA, UDP, and SCTP. It is available in the RHEL and CentOS Server channel, so no third-party packages are required. Install qperf from the on both the server and client host:
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