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Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
In 1968 Shirley Chisholm became the first Black woman elected to the United States Congress. In 1972 she launched a campaign for the Democratic presidential nomination, breaking another political barrier.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
Branch trace is a computer program debugging tool or analysis technique. It is an abbreviated instruction trace in which only the successful branch instructions are recorded. On IBM System/360 this was implemented as part of Program-Event Recording (PER)[1] but was seldom used at the application programming level. Program Event Recording hardware was used and due to the overhead of this tool, it was removed from customer-available MVS systems.
Branch tracing is also available for Pentium 4, Xeon and later Intel processors.[2] There are dedicated processor commands to enable branch tracing and save executed branches into special Intel Branch Trace Store (BTS) area of resident memory. The Branch Trace Store can be also configured to be a circular buffer, so that last executed branches are recorded. Branch tracing on Intel processors using the Branch Trace Store can cause 40x application run-time slow down.[3] For the Intel Core M and the 5th Generation of Intel Processors, Intel PT (Processor Trace) has been introduced, which aims to provide a full control flow trace. Intel PT is said to have only a minimum impact on the program's execution (< 5%).[4]
With the availability and reference to a compiler listing of the program together with a branch trace, the full path of executed instructions can be reconstructed. With a lot more effort, the full path can even be reconstructed with a memory dump (containing the program storage) and a branch trace.
A more comprehensive trace of all the instructions (including instructions between branches) can be obtained by the use of an instruction set simulator (where available on some platforms). A full instruction trace can provide additional information such as address/length and value of memory alterations.
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Branch trace is a computer program debugging tool or analysis technique. It is an abbreviated instruction trace in which only the successful branch instructions are recorded. On IBM System/360 this was implemented as part of Program-Event Recording (PER) but was seldom used at the application programming level. Program Event Recording hardware was used and due to the overhead of this tool, it was removed from customer-available MVS systems. Branch tracing is also available for Pentium 4, Xeon and later Intel processors. There are dedicated processor commands to enable branch tracing and save executed branches into special Intel Branch Trace Store (BTS) area of resident memory. The Branch Trace Store can be also configured to be a circular buffer, so that last executed branches are recorded. Branch tracing on Intel processors using the Branch Trace Store can cause 40x application run-time slow down. For the Intel Core M and the 5th Generation of Intel Processors, Intel PT (Processor Trace) has been introduced, which aims to provide a full control flow trace. Intel PT is said to have only a minimum impact on the program's execution (< 5%).
The Logan Trace was a wilderness trail through central Kentucky, a branch of Daniel Boone's Wilderness Road. It was named after its originator, Colonel Benjamin Logan. Logan came over the mountains with Boone in 1775, but went west toward Buffalo Spring instead of north. Its terminus was northwest of present-day Stanford, Kentucky, where Logan built a fort known as Logan's Station or St. Asaph. Stanford eventually emerged from Logan's original settlement.
Trace scheduling is an optimization technique developed by Josh Fisher used in compilers for computer programs. A compiler often can, by rearranging its generated machine instructions for faster execution, improve program performance. It increases ILP (Instruction Level Parallelism) along the important execution path by statically predicting frequent execution path. Trace scheduling is one of many known techniques for doing so. A trace is a sequence of instructions, including branches but not including loops, that is executed for some input data. Trace scheduling uses a basic block scheduling method to schedule the instructions in each entire trace, beginning with the trace with the highest frequency. It then adds compensation code at the entry and exit of each trace to compensate for any effects that out-of-order execution may have had. This can result in large increases in code sizes and poor or erratic performance if program's behavior varies significantly with the input. Trace scheduling was originally developed for Very Long Instruction Word, or VLIW machines, and is a form of global code motion. It works by converting a loop to long straight-line code sequence using loop unrolling and static branch prediction. This process separates out "unlikely" code and adds handlers for exits from trace. The goal is to have the most common case executed as a sequential set of instructions without branches.
Trace Fork or Trace Branch is a creek in Perry County, Kentucky in the United States. It a fork of Lotts Creek 1 mile (1.6 km) upstream from the latter's mouth at an altitude of 825 feet (251 m).
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →The Greenwood District.