10/28/2022 0 Comments Ultravnc vs tightvnc![]() TurboVNC's encoding methods have been adopted by TigerVNC, libvncserver, and others. TurboVNC is the product of extensive research, in which many different permutations of the TightVNC encoder were benchmarked at the low level against a variety of captured RFB sessions that simulate real-world application workloads, both 2D and 3D. Furthermore, TurboVNC eliminates buffer copies, it maximizes network efficiency by splitting framebuffer updates into relatively large subrectangles, and it uses only the zlib compression levels that can be shown to have a measurable performance benefit. However, TurboVNC also eliminates the CPU-hungry smoothness detection routines that TightVNC 1.3.x used to determine whether a subrectangle is a good candidate for JPEG compression, and TurboVNC's encoding methods tend to favor the use of JPEG more, since it is now generally the fastest subencoding type. Part of TurboVNC's speedup comes from the use of libjpeg-turbo. zlib can optionally be used to compress the indexed color, mono and raw subrectangles. The process by which TurboVNC does this is referred to as an "encoding method." A rectangle is first analyzed to determine if any significant portion of it is solid, and if so, that portion is encoded as a bounding box and a fill color ("Solid subencoding.") Of the remaining subrectangles, those with only two colors are encoded as a 1-bit-per-pixel bitmap with a 2-color palette ("Mono subencoding"), those with low numbers of unique colors are encoded as a color palette and an 8-bit-per-pixel bitmap ("Indexed color subencoding"), and subrectangles with high numbers of unique colors are encoded using either JPEG or arrays of RGB pixels ("Raw subencoding"), depending on the encoding method. #ULTRAVNC VS TIGHTVNC UPDATE#Furthermore, TurboVNC contains some unique features that are designed specifically for visualization applications.Īll VNC implementations, including TurboVNC, use the RFB (remote framebuffer) protocol to send “framebuffer updates” from the VNC server to any connected "viewers." Each framebuffer update can contain multiple "rectangles" (regions that have changed since the last update.) As with TightVNC, TurboVNC analyzes each rectangle, splits it into multiple "subrectangles", and attempts to encode each subrectangle using the "subencoding type" that will provide the most efficient compression, given the number of unique colors in the subrectangle. Using non-default settings, TurboVNC can also match the best compression ratios produced by TightVNC 1.3.x for 2D workloads. In addition, TurboVNC compresses 3D and video workloads significantly better than the “tightest” compression mode in TightVNC 1.3.x while using only typically 15-20% of the CPU time of the latter. ![]() ![]() #ULTRAVNC VS TIGHTVNC CODE#However, the current version of TurboVNC contains a much more modern X server code base (based on X.org 7.7) and a variety of other features and fixes not present in TightVNC, including a high-performance Java viewer. #ULTRAVNC VS TIGHTVNC WINDOWS#TurboVNC was originally a fork of TightVNC 1.3.x, and on the surface, the X server and Windows viewer still behave similarly to their parents. ![]() TurboVNC is a derivative of VNC (Virtual Network Computing) that is tuned to provide peak performance for 3D and video workloads. ![]()
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