Experimental Methods for the Evaluation of Big Data Systems Abdulqawi Saif
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Lttng and the Love of Development Without Printf() [email protected]
Fosdem 2014 + LTTng and the love of development without printf() [email protected] 1 whoami David Goulet, Software Developer, EfficiOS, Maintainer of LTTng-tools project ● https://git.lttng.org//lttng-tools.git 2 Content Quick overview of LTTng 2.x Everything else you need to know! Recent features & future work. 3 What is tracing? ● Recording runtime information without stopping the process – Enable/Disable event(s) at runtime ● Usually used during development to solve problems like performance, races, etc... ● Lots of possibilities on Linux: LTTng, Perf, ftrace, SystemTap, strace, ... 4 OverviewOverview ofof LTTngLTTng 2.x2.x 5 Overview of LTTng 2.x Unified user interface, kernel and user space tracers combined. (No need to recompile kernel) Trace output in a unified format (CTF) – https://git.efficios.com/ctf.git Low overhead, Shipped in distros: Ubuntu, Debian, Suse, Fedora, Linaro, Wind River, etc. 6 Tracers ● lttng-modules: kernel tracer module, compatible with kernels from 2.6.38* to 3.13.x, ● lttng-ust: user-space tracer, in-process library. * Kernel tracing is now possible on 2.6.32 to 2.6.37 by backport of 3 Linux Kernel patches. 7 Utilities ● lttng-tools: cli utilities and daemons for trace control, – lttng: cli utility for tracing control, – lttng-ctl: tracing control API, – lttng-sessiond: tracing registry daemon, – lttng-consumerd: extract trace data, – lttng-relayd: network streaming daemon. 8 Viewers ● babeltrace: cli text viewer, trace converter, plugin system, ● lttngtop: ncurse top-like viewer, ● Eclipse lttng plugin: front-end for lttng, collect, visualize and analyze traces, highly extensible. 9 LTTng-UST – How does it work? Users instrument their applications with static tracepoints, liblttng-ust, in-process library, dynamically linked with application, Session setup, etc., Run app, collect traces, Post analysis with viewers. -
Flame Graphs Freebsd
FreeBSD Developer and Vendor Summit, Nov, 2014 Flame Graphs on FreeBSD Brendan Gregg Senior Performance Architect Performance Engineering Team [email protected] @brendangregg Agenda 1. Genesis 2. Generaon 3. CPU 4. Memory 5. Disk I/O 6. Off-CPU 7. Chain 1. Genesis The Problem • The same MySQL load on one host runs at 30% higher CPU than another. Why? • CPU profiling should answer this easily # dtrace -x ustackframes=100 -n 'profile-997 /execname == "mysqld"/ {! @[ustack()] = count(); } tick-60s { exit(0); }'! dtrace: description 'profile-997 ' matched 2 probes! CPU ID FUNCTION:NAME! 1 75195 :tick-60s! [...]! libc.so.1`__priocntlset+0xa! libc.so.1`getparam+0x83! libc.so.1`pthread_getschedparam+0x3c! libc.so.1`pthread_setschedprio+0x1f! mysqld`_Z16dispatch_command19enum_server_commandP3THDPcj+0x9ab! mysqld`_Z10do_commandP3THD+0x198! mysqld`handle_one_connection+0x1a6! libc.so.1`_thrp_setup+0x8d! libc.so.1`_lwp_start! 4884! ! mysqld`_Z13add_to_statusP17system_status_varS0_+0x47! mysqld`_Z22calc_sum_of_all_statusP17system_status_var+0x67! mysqld`_Z16dispatch_command19enum_server_commandP3THDPcj+0x1222! mysqld`_Z10do_commandP3THD+0x198! mysqld`handle_one_connection+0x1a6! libc.so.1`_thrp_setup+0x8d! libc.so.1`_lwp_start! 5530! # dtrace -x ustackframes=100 -n 'profile-997 /execname == "mysqld"/ {! @[ustack()] = count(); } tick-60s { exit(0); }'! dtrace: description 'profile-997 ' matched 2 probes! CPU ID FUNCTION:NAME! 1 75195 :tick-60s! [...]! libc.so.1`__priocntlset+0xa! libc.so.1`getparam+0x83! this stack libc.so.1`pthread_getschedparam+0x3c! -
Linuxcon North America 2012
LinuxCon North America 2012 LTTng 2.0 : Tracing, Analysis and Views for Performance and Debugging. E-mail: [email protected] Mathieu Desnoyers August 29th, 2012 1 > Presenter ● Mathieu Desnoyers ● EfficiOS Inc. ● http://www.efficios.com ● Author/Maintainer of ● LTTng, LTTng-UST, Babeltrace, Userspace RCU Mathieu Desnoyers August 29th, 2012 2 > Content ● Tracing benefits, ● LTTng 2.0 Linux kernel and user-space tracers, ● LTTng 2.0 usage scenarios & viewers, ● New features ready for LTTng 2.1, ● Conclusion Mathieu Desnoyers August 29th, 2012 3 > Benefits of low-impact tracing in a multi-core world ● Understanding interaction between ● Kernel ● Libraries ● Applications ● Virtual Machines ● Debugging ● Performance tuning ● Monitoring Mathieu Desnoyers August 29th, 2012 4 > Tracing use-cases ● Telecom ● Operator, engineer tracing systems concurrently with different instrumentation sets. ● In development and production phases. ● High-availability, high-throughput servers ● Development and production: ensure high performance, low-latency in production. ● Embedded ● System development and production stages. Mathieu Desnoyers August 29th, 2012 5 > LTTng 2.0 ● Rich ecosystem of projects, ● Key characteristics of LTTng 2.0: – Small impact on the traced system, fast, user- oriented features. ● Interfacing with: Common Trace Format (CTF) Interoperability Between Tracing Tools Tracing Well With Others: Integration with the Common Trace Format (CTF), of GDB Tracepoints Into Trace Tools, Mathieu Desnoyers, EfficiOS, Stan Shebs, Mentor Graphics, -
Linux Performance Tools
Linux Performance Tools Brendan Gregg Senior Performance Architect Performance Engineering Team [email protected] @brendangregg This Tutorial • A tour of many Linux performance tools – To show you what can be done – With guidance for how to do it • This includes objectives, discussion, live demos – See the video of this tutorial Observability Benchmarking Tuning Stac Tuning • Massive AWS EC2 Linux cloud – 10s of thousands of cloud instances • FreeBSD for content delivery – ~33% of US Internet traffic at night • Over 50M subscribers – Recently launched in ANZ • Use Linux server tools as needed – After cloud monitoring (Atlas, etc.) and instance monitoring (Vector) tools Agenda • Methodologies • Tools • Tool Types: – Observability – Benchmarking – Tuning – Static • Profiling • Tracing Methodologies Methodologies • Objectives: – Recognize the Streetlight Anti-Method – Perform the Workload Characterization Method – Perform the USE Method – Learn how to start with the questions, before using tools – Be aware of other methodologies My system is slow… DEMO & DISCUSSION Methodologies • There are dozens of performance tools for Linux – Packages: sysstat, procps, coreutils, … – Commercial products • Methodologies can provide guidance for choosing and using tools effectively • A starting point, a process, and an ending point An#-Methodologies • The lack of a deliberate methodology… Street Light An<-Method 1. Pick observability tools that are: – Familiar – Found on the Internet – Found at random 2. Run tools 3. Look for obvious issues Drunk Man An<-Method • Tune things at random until the problem goes away Blame Someone Else An<-Method 1. Find a system or environment component you are not responsible for 2. Hypothesize that the issue is with that component 3. Redirect the issue to the responsible team 4. -
Advanced Linux Tracing Technologies for Online Surveillance of Software Systems
Advanced Linux tracing technologies for Online Surveillance of Software Systems M. Couture DRDC – Valcartier Research Centre Defence Research and Development Canada Scientific Report DRDC-RDDC-2015-R211 October 2015 © Her Majesty the Queen in Right of Canada, as represented by the Minister of National Defence, 2015 © Sa Majesté la Reine (en droit du Canada), telle que représentée par le ministre de la Défense nationale, 2015 Abstract This scientific report provides a description of the concepts and technologies that were developed in the Poly-Tracing Project. The main product that was made available at the end of this four-year project is a new software tracer called Linux Trace Toolkit next generation (LTTng). LTTng actually represents the centre of gravity around which much more applied research and development took place in the project. As shown in this document, the technologies that were produced allow the exploitation of the LTTng tracer and its output for two main purposes: a- solving today’s increasingly complex software bugs and b- improving the detection of anomalies within live information systems. This new technology will enable the development of a set of new tools to help detect the presence of malware and malicious activity within information systems during operations. Significance to defence and security All the technologies described in this document result from collaborative R&D efforts (the Poly-Tracing project), which involved the participation of NSERC, Ericsson Canada, DRDC – Valcartier Research Centre, and the following Canadian universities: Montreal Polytechnique, Laval University, Concordia University, and the University of Ottawa. This scientific report should be considered as one of the Platform-to-Assembly Secured Systems (PASS) deliverables. -
Monitoring Container Environment with Prometheus and Grafana
Matti Holopainen Monitoring Container Environment with Prometheus and Grafana Metropolia University of Applied Sciences Bachelor of Engineering Information and Communication Technology Bachelor’s Thesis 3.5.2021 Abstract Tekijä Matti Holopainen Otsikko Monitoring Container Environment with Prometheus and Grafana Sivumäärä Aika 50 sivua 3.5.2021 Tutkinto Insinööri (AMK) Tutkinto-ohjelma Tieto- ja viestintätekniikka Ammatillinen pääaine Ohjelmistotuotanto Ohjaajat Nina Simola, Projektipäällikkö Auvo Häkkinen, Yliopettaja Insinöörityön tavoitteena oli oppia pystyttämään monitorointijärjestelmä konttiympäristön re- surssien käytön seuraamista, monitorointia ja analysoimista varten. Tavoitteena oli helpot- taa monitorointijärjestelmän käyttöönottoa. Työ tehtiin käytettävien ohjelmistojen dokumen- taation ja käytännön tekemisellä opittujen asioiden pohjalta. Insinöörityön alussa käytiin läpi työssä käytettyjä teknologioita. Tämän jälkeen käytiin läpi monitorointi järjestelmän konfiguraatio ja käyttöönotto. Seuraavaksi tutustuttiin PromQL-ha- kukieleen, jonka jälkeen näytettiin kuinka pystyttää valvontamonitori ja hälytykset sähköpos- timuistutuksella. Työn lopussa käydään läpi kuinka monitorointijärjestelmässä saatua dataa analysoidaan ja mietitään miten monitorointijärjestelmää voisi parantaa. Keywords Monitorointi, Kontti, Prometheus, Grafana, Docker Abstract Author Matti Holopainen Title Monitoring Container Environment with Prometheus and Grafana Number of Pages Date 50 pages 3.5.2021 Degree Bachelor of Engineering Degree Programme Information -
Powerful Software Analysis System-Wide Tracing Is Here
DATASHEET Powerful Software Analysis Benefits Software tracing is an efficient way to record information about a program’s execution. Programmers, TRACEexperienced system administrators, and technical supportCOMPASS personnel use • Faster resolution of complex problems it to diagnose problems, tune for performance, and improve • Clear understanding of system behaviour comprehension of system behavior. Trace Compass facilitates the visualization and analysis of traces and logs • System performance optimization from multiple sources; it enables diagnostic and monitoring • Adds value in many stages of a product’s operations from a simple device to an entire cloud. life cycle: development, test, production • Facilitates the addition of new parsers, analyses, and views to solve specific issues System-Wide Tracing is here • Scales to GBs of compact binary trace Trace Compass can take multiple traces and logs from • Correlate traces from different nodes in a different sources and formats, and merge them into a single cloud with trace synchronization event stream that allows system-wide tracing. It is possible to correlate application, virtual machine, operating systems, • Multi-platform: Linux, Windows, MacOSX. bare metal, and hardware traces and to display the results together, delivering unprecedented insight into your entire system. Overview • Can be integrated into Eclipse IDE or used as a standalone application. Eclipse plug-ins facilitates the addition of new analysis and views. • Provides an extensible framework written in Java that exposes a generic interface for integration of logs or trace data input. • Custom text or XML parsers can be added directly from the graphical interface by the user. • Extendable to support various proprietary log or trace files. -
Fine-Grained Distributed Application Monitoring Using Lttng
OSSOSS EuropeEurope 20182018 Fine-grained Distributed Application Monitoring Using LTTng [email protected] jgalar PresenterPresenter Jérémie Galarneau EfficiOS Inc. – Vice President – http://www.efficios.com Maintainer of – LTTng-tools – Babeltrace OSS Europe 2018 2 OutlineOutline A few words about tracing and LTTng The (long) road to session rotation mode How session rotation mode makes distributed trace analyses possible (and how to implement them) OSS Europe 2018 3 Isn’tIsn’t tracingtracing justjust anotheranother namename forfor logging?logging? Tracers are not completely unlike loggers Both save information used to understand the state of an application – Trying to cater to developers, admins, and end-users In both cases, a careful balance must be achieved between verbosity, performance impact, and usefulness – Logging levels – Enabling only certain events OSS Europe 2018 4 DifferentDifferent goals,goals, differentdifferent tradeoffstradeoffs Tracers tend to focus on low-level events – Capture syscalls, scheduling, filesystem events, etc. – More events to capture means we must lower the space and run-time cost per event – Binary format – Different tracers use different strategies to minimize cost OSS Europe 2018 5 DifferentDifferent goals,goals, differentdifferent tradeoffstradeoffs Traces are harder to work with than text log files – File size ● Idle 4-core laptop: 54k events/sec @ 2.2 MB/sec ● Busy 8-core server: 2.7M events/sec @ 95 MB/sec – Exploration can be difficult – Must know the application or kernel to -
Deploying Lttng on Exotic Embedded Architectures
Deploying LTTng on Exotic Embedded Architectures Mathieu Desnoyers Michel R. Dagenais École Polytechnique de Montréal École Polytechnique de Montréal [email protected] [email protected] Abstract shipping LTTng with their Linux distribution to provide similar features as in VxWorks. Mon- tavista also integrates LTTng to their Carrier This paper presents the considerations that Grade Linux distribution. comes into play when porting the LTTng tracer to a new architecture. Given the aleady portable LTTng currently supports the following archi- design of the tracer, very targeted additions can tectures : enable tracing on a great variety of architec- tures. The main challenge is to understand the architecture time-base in enough depth to • X86 32/64 integrate it to LTTng by creating a lock-less fast and fine-grained trace clock. The ARM • MIPS OMAP3 LTTng port will be used as an exam- ple. • PowerPC 32/64 • ARM1 1 Introduction • S390 2 Gathering an execution trace at the operating • Sparc 32/643 system level has been an important part of the embedded system development process, as il- • SH644 lustrates the case of the Mars Pathfinder[5] pri- ority inversion, solved by gathering an execu- tion trace. This paper presents the key abstractions re- In the Linux environment, such system-wide quired to port LTTng to a new architecture, facility is just becoming accepted in the main- mainly describing what considerations must be line kernel, but with the kernel developer audi- taken into account when designing a trace clock ence as main target. The portability issues and time source suitable for tracing, meeting the lack of user-oriented tools to manipulate the platform-specific constraints. -
Towards Efficient Instrumentation for Reverse-Engineering Object Oriented Software Through Static and Dynamic Analyses
Towards Efficient Instrumentation for Reverse-Engineering Object Oriented Software through Static and Dynamic Analyses by Hossein Mehrfard A dissertation submitted to the Faculty of Graduate and Postdoctoral Affairs in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The Ottawa-Carleton Institute for Electrical and Computer Engineering Carleton University Ottawa, Ontario © 2017 Hossein Mehrfard Abstract In software engineering, program analysis is usually classified according to static analysis (by analyzing source code) and dynamic analysis (by observing program executions). While static analysis provides inaccurate and imprecise results due to programming language's features (e.g., late binding), dynamic analysis produces more accurate and precise results at runtime at the expense of longer executions to collect traces. One prime mechanism to observe executions in dynamic analysis is to instrument either the code or the binary/byte code. Instrumentation overhead potentially poses a serious threat to the accuracy of the dynamic analysis, especially for time dependent software systems (e.g., real-time software), since it can cause those software systems to go out of synchronization. For instance, in a typical real-time software, the dynamic analysis result is correct if the instrumentation overhead, which is due to gathering dynamic information, does not add to the response time of real-time behaviour to the extent that deadlines may be missed. If a deadline is missed, the dynamic analysis result and the system’s output are not accurate. There are two ways to increase accuracy of a dynamic analysis: devising more efficient instrumentation and using a hybrid (static plus dynamic) analysis. -
A System-Wide Unified CPU and GPU Tracing Tool for Opencl Applications
Hindawi Publishing Corporation Advances in Soware Engineering Volume 2015, Article ID 940628, 14 pages http://dx.doi.org/10.1155/2015/940628 Research Article LTTng CLUST: A System-Wide Unified CPU and GPU Tracing Tool for OpenCL Applications David Couturier and Michel R. Dagenais Department of Computer and Software Engineering, Polytechnique Montreal, P.O. Box 6079, Station Downtown, Montreal, QC, Canada H3C 3A7 Correspondence should be addressed to David Couturier; [email protected] Received 14 April 2015; Accepted 1 July 2015 Academic Editor: Moreno Marzolla Copyright © 2015 D. Couturier and M. R. Dagenais. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. As computation schemes evolve and many new tools become available to programmers to enhance the performance of their applications, many programmers started to look towards highly parallel platforms such as Graphical Processing Unit (GPU). Offloading computations that can take advantage of the architecture of the GPU is a technique that has proven fruitful in recent years. This technology enhances the speed and responsiveness of applications. Also, as a side effect, it reduces the power requirements for those applications and therefore extends portable devices battery life and helps computing clusters to run more power efficiently. Many performance analysis tools such as LTTng, strace and SystemTap already allow Central Processing Unit (CPU) tracing and help programmers to use CPU resources more efficiently. On the GPU side, different tools suchas Nvidia’s Nsight, AMD’s CodeXL, and third party TAU and VampirTrace allow tracing Application Programming Interface (API) calls and OpenCL kernel execution. -
Pentest-Report Prometheus 05.-06.2018 Cure53, Dr.-Ing
Dr.-Ing. Mario Heiderich, Cure53 Bielefelder Str. 14 D 10709 Berlin cure53.de · [email protected] Pentest-Report Prometheus 05.-06.2018 Cure53, Dr.-Ing. M. Heiderich, M. Wege, MSc. N. Krein, BSc. J. Hector, Dipl.-Ing. A. Inführ, J. Larsson Index Introduction Scope Test Methodology Part 1 (Manual Code Auditing) Part 2 (Code-Assisted Penetration Testing) Hardening Recommendations General Security Recommendations HTTP Security Headers Content Security Policy & Beyond Authentication / Authorization Non-Idempotent Request Protection Transport Security Clients/metrics endpoint API Endpoint Admin GUI Identified Vulnerabilities PRM-01-001 Web: Prometheus lifecycle killed with CSRF (Medium) PRM-01-003 Web: CORS header exposes API data to all origins (High) PRM-01-005 Server: Clients can cause Denial of Service via Gzip Bomb (Medium) Miscellaneous Issues PRM-01-002 Client: Clients leak Metrics data through unprotected endpoint (Low) PRM-01-004 Web: Parameters used insecurely in HTML templates (Low) Conclusions Cure53, Berlin · 06/11/18 1/18 Dr.-Ing. Mario Heiderich, Cure53 Bielefelder Str. 14 D 10709 Berlin cure53.de · [email protected] Introduction “An open-source monitoring system with a dimensional data model, flexible query language, efficient time series database and modern alerting approach.” From https://prometheus.io/ This report documents the findings of a security assessment targeting the Prometheus software compound and carried out by Cure53 in 2018. It should be noted that the project was sponsored by The Linux Foundation / Cloud Native Computing Foundation. In terms of the scope, the assignment entailed two main components as the Prometheus project was investigated through both a dedicated source code audit and comprehensive penetration testing.