Dr. Dobb's Journal - October 2007 - (Page 56) State of the Art LOGGING IN C++ The framework offers some nice formatting rules in a small, easy-to-use package Figure 1: Log speed tests. instance, the sed program), and compare the two outputs. Even though the output files can be huge, it is the difference between them that matters, and that difference tends to be small and highly informative. Another nice outcome of using this log framework was combining the logging of multiple different applications (or multiple instances of a single application) in a single unique file. Just open the same file from several applications in append mode, and voila—nicely interleaved logs from various processes! The resulted log file is still meaningful and (on a decent operating system at least) preserves log lines as atomic units. I’ve done some measurements to actually see how fast the runtime mechanism is (versus the compile time). The results turned out to be very good. I ran the same code in three different configurations: • off-INFO. log disabled at compile time, used as a base line. • on-INFO. log enabled at compile time, disabled at runtime (using INFO level of detail). • on-DEBUG4. log enabled at runtime and compile time (using DEBUG4 level of detail). Each configuration was run multiple (20) times (to eliminate the possible random errors). Figure 1 and Table 1 illustrate the results. As you can see, the runtime performance (25.109 sec) matches the compile time (25.109 sec). That means you really will pay for logging only if you are going to use it. I found very useful in practice to also output the thread ID from where the output comes from along with the timestamp and logging level. This is a real help when reading a log file that comes from a multithreading application. DDJ 56 Dr. Dobb’s Journal l www.ddj.com l October 2007 http://www.ddj.com
Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - October 2007 Cover Contents Hmmmm Alia Vox Developer Diaries Developer’s Notebook AI: It’s OK Again! Conversations Visual Cryptography and Bit-Plane Complexity Segmentation Inside the Windows Vista Disk Encryption Algorithm Memory-Aware Components Software and the Core Description Process Logging In C++ Effective Concurrency The Agile Edge Swaine’s Flames Dr. Dobb's Journal - October 2007 Dr. Dobb's Journal - October 2007 - Cover (Page Cover1) Dr. Dobb's Journal - October 2007 - Cover (Page Cover2) Dr. Dobb's Journal - October 2007 - Cover (Page 1) Dr. Dobb's Journal - October 2007 - Cover (Page 2) Dr. Dobb's Journal - October 2007 - Cover (Page 3) Dr. Dobb's Journal - October 2007 - Contents (Page 4) Dr. Dobb's Journal - October 2007 - Contents (Page 5) Dr. Dobb's Journal - October 2007 - Hmmmm (Page 6) Dr. Dobb's Journal - October 2007 - Hmmmm (Page 7) Dr. Dobb's Journal - October 2007 - Hmmmm (Page 8) Dr. Dobb's Journal - October 2007 - Hmmmm (Page 9) Dr. Dobb's Journal - October 2007 - Alia Vox (Page 10) Dr. Dobb's Journal - October 2007 - Alia Vox (Page 11) Dr. Dobb's Journal - October 2007 - Developer Diaries (Page 12) Dr. Dobb's Journal - October 2007 - Developer Diaries (Page 13) Dr. Dobb's Journal - October 2007 - Developer’s Notebook (Page 14) Dr. Dobb's Journal - October 2007 - Developer’s Notebook (Page 15) Dr. Dobb's Journal - October 2007 - AI: It’s OK Again! (Page 16) Dr. Dobb's Journal - October 2007 - AI: It’s OK Again! (Page 17) Dr. Dobb's Journal - October 2007 - AI: It’s OK Again! (Page 18) Dr. Dobb's Journal - October 2007 - AI: It’s OK Again! (Page 19) Dr. Dobb's Journal - October 2007 - Conversations (Page 20) Dr. Dobb's Journal - October 2007 - Conversations (Page 21) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 22) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 23) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 24) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 25) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 26) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 27) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 28) Dr. Dobb's Journal - October 2007 - Visual Cryptography and Bit-Plane Complexity Segmentation (Page 29) Dr. Dobb's Journal - October 2007 - Inside the Windows Vista Disk Encryption Algorithm (Page 30) Dr. Dobb's Journal - October 2007 - Inside the Windows Vista Disk Encryption Algorithm (Page 31) Dr. Dobb's Journal - October 2007 - Inside the Windows Vista Disk Encryption Algorithm (Page 32) Dr. Dobb's Journal - October 2007 - Inside the Windows Vista Disk Encryption Algorithm (Page 33) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 34) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 35) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 36) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 37) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 38) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 39) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 40) Dr. Dobb's Journal - October 2007 - Memory-Aware Components (Page 41) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 42) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 43) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 44) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 45) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 46) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 47) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 48) Dr. Dobb's Journal - October 2007 - Software and the Core Description Process (Page 49) Dr. Dobb's Journal - October 2007 - Logging In C++ (Page 50) Dr. Dobb's Journal - October 2007 - Logging In C++ (Page 51) Dr. Dobb's Journal - October 2007 - Logging In C++ (Page 52) Dr. Dobb's Journal - October 2007 - Logging In C++ (Page 53) Dr. Dobb's Journal - October 2007 - Logging In C++ (Page 54) Dr. Dobb's Journal - October 2007 - Logging In C++ (Page 55) Dr. Dobb's Journal - October 2007 - Logging In C++ (Page 56) Dr. Dobb's Journal - October 2007 - Effective Concurrency (Page 57) Dr. Dobb's Journal - October 2007 - Effective Concurrency (Page 58) Dr. Dobb's Journal - October 2007 - Effective Concurrency (Page 59) Dr. Dobb's Journal - October 2007 - The Agile Edge (Page 60) Dr. Dobb's Journal - October 2007 - The Agile Edge (Page 61) Dr. Dobb's Journal - October 2007 - The Agile Edge (Page 62) Dr. Dobb's Journal - October 2007 - The Agile Edge (Page 63) Dr. Dobb's Journal - October 2007 - Swaine’s Flames (Page 64) Dr. Dobb's Journal - October 2007 - Swaine’s Flames (Page Cover3) Dr. Dobb's Journal - October 2007 - Swaine’s Flames (Page Cover4)
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