- #CODERUSH SLOWING DOWN VISUAL STUDIO 2018 FULL#
- #CODERUSH SLOWING DOWN VISUAL STUDIO 2018 CODE#
- #CODERUSH SLOWING DOWN VISUAL STUDIO 2018 WINDOWS#
However, if you work on large binaries or you use a coding style or project system (like some variants of a Unity build) that commonly results in object files being added or removed, the hit to incremental link time can be tens of seconds or more.
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For many developers, this isn’t a big deal since they rarely add new object files and/or full linking isn’t terribly long anyway. It makes sense that high-impact edits, like changing compiler or linker options or touching a widely-included header file require a rebuild, but simply adding a new object (.obj) file will also trigger a full re-link. However, it can’t accommodate all source changes and will sometimes be forced to fall back on full linking, which means the overall incremental link time can actually be worse than a full link, since incremental linking will spend time figuring out it can’t proceed before starting over from scratch. It allows developers to iterate quickly when making common source changes in large projects by reusing most of the results of earlier links and strategically applying the differences made in the last source edit. Incremental linking is one of the most time-saving features of our toolset. Note that the first item, caching the previous request’s result, was responsible for the vast majority of the PDB reading wins.
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Avoid virtual function calls and manually inline code for the two most common symbol lookups. Re use rather than re build hash tables. page size) rather than division by a variable Use integer division by a constant (e.g. Improve memory-mapped file reading by using AVX-based memcpy tuned for multiples of the page size. Create fast-path for the VS debugger’s query pattern. Compute older CRC-32 hash for type records on-demand (gives the most speedup in /Zi full link). Avoid search by Relative Virtual Address (RVA) by caching the result of the previous request, which in 99% of cases uses the same RVA. Below are some examples of the types of algorithmic improvements we made. What We Didįor version 16.6, we profiled some common developer scenarios and found several opportunities to improve the code that both reads and writes debug information. #CODERUSH SLOWING DOWN VISUAL STUDIO 2018 WINDOWS#
The actual benefit depends on the size of your project and the number of debugger windows (watch, callstack, etc.) you have open, but the good news is that users who encountered stepping delays in the past are likely to notice improvements in version 16.6. Perhaps more compelling, though, is that since version 16.6 was released, the time to enter break state after a single step is faster by about 2X on average.
Up to 4X speedup in switching active function on call stack with many variables. That is, they are not cherry-picked outliers. However, all are indicative of the type of speedup we saw across multiple projects. Note that the absolute time deltas in the chart are examples taken from different projects. The following chart has some examples of the improvements we saw. In our private benchmarks, these improvements showed some big gains in AAA Games and other large scenarios. It features prominently in profiles when hitting breakpoints and single-stepping-particularly when the developer has multiple debug windows like the Call Stack and Watch windows open in Visual Studio. Furthermore, PDB reading is a significant contributor to delays when debugging large projects. Program Database (PDB) creation is often the bottleneck when linking binaries, and for large, monolithic codebases, linking ends up being a very long pole at the end of the critical path. The second, in Visual Studio 2019 version 16.7, is an optimization to speed up the worst case Incremental Linking time, which can be as bad as or worse than a full link. The first, in Visual Studio 2019 version 16.6, is an improvement to some of the algorithms inside the Program Database (PDB) and Debug Interface Access (DIA) components, which are the libraries that enable writing and reading debug information respectively. We found a couple of opportunities that looked promising and went after them. We were still looking at large projects like AAA games and Chrome because large projects are most likely to suffer from longer iteration times. Keep reading to find out the details.Īfter the link time improvements in versions 16.0 and 16.2, we took a step back and re-evaluated the complete edit-build-debug (“inner loop”) experience of C++ developers. These represent some of the improvements The Coalition saw in their recent experiment. As of version 16.7, we measure up to 5X improvement in some incremental linking and debugging scenarios and up to a 1.5X speedup in full linking. We made improvements to C++ link time earlier in Visual Studio 2019, and we have more improvements to tell you about.
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